This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The radius of a circle whose area is equal to the sum of the areas of two circles of radii are 5 cm and 12 cm is |
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Answer» Given two circle radii are 5cm and 12cm |
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| 2. |
ply the following\( 10.51 \times 10 \) |
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Answer» 10.51 x 10= 105.1 |
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| 3. |
Rakesh is much worried about his upcoming assessment on A. P. He was vigorously practicing for the exam but unable to solve some questions. One of these questions is as shown. If the 3rd and the 9th terms of an A.P. are 4 and –8 respectively, then help Rakesh in solving the problem. i) Form an A.P using the given data ii) Find which term of the A.P. is –160? |
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Answer» i) a3 = a + 2d = 4 …… (i) and a9 = a + 8d = –8 ….. (ii) Subtracting (i) from (ii), we get 6d = –12 ⇒ d = –2 d = –2 and a3 = a + 2d = 4 ⇒ a = 4 – 2(–2) = 4 + 4 = 8 So, the AP is 8, 6, 4, 2, 0, -2,…. ii) Here, a = 8 and d = –2 and an = –160 Also, an = a + (n-1)d ⇒ –160 = 8 + (n-1)(–2) ⇒ –160 – 8 = –2n+2 ⇒ n = 85 |
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| 4. |
Find:\(\frac{3x +4}{2x-5} = \frac{9}{4}\) |
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Answer» \(\frac{3x +4}{2x-5} = \frac{9}{4}\) 4(3x+4) = 9(2x-5) 12x + 16 = 18x - 45 12x - 18x = -45 - 16 -6x = -61 x = 61/6 |
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| 5. |
In an AP, if the third term and seventh term are 4 and 8 respectively, then find which term value is zero. |
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Answer» Given:- In an AP, if the third term and seventh term are 4 and 8 respectively. To find:- Find which term value is zero ? Third term of the given AP = 4 t3 = 4 a + 2d = 4 ------(1) Seventh term of the given AP = 8 t7 = 8 a + 6d = 8 ------(2) On solving (1) & (2) a + 2d = 4 a + 6d = 8 (-) _________ 0 - 4d = -4 _________ => -4d = -4 => 4d = 4 => d = 4/4 => d = 1 Common difference of the AP = 1 On Substituting the value of d in (1) => a+2(1) = 4 => a+2 = 4 =>a = 4-2 => a = 2 First term of the AP = 2 Then the AP :2,3,4,5,6,7,8.... Let nth term of the AP will be zero => tn = 0 => a+(n-1)d = 0 => 2+(n-1)(1) = 0 => 2+(n-1) = 0 => 2+n-1 = 0 => n+1 = 0 => n = -1 Number of terms = -1 n = -1 , but n can not be negative So there is no such term in the given AP can not be equal to zero. And also It is an increasing series (AP) |
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| 6. |
Without actually performing the long division, State whether 15/1600 rational number will have a terminating decimal expansion or a non-terminating repeating decimal expansion. If it have terminating decimal expansion, then write down the decimal expansion of it. |
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Answer» 15/ 1600 Factorizing the denominator, we get, 1600 = 2652 Since, the denominator is in the form of 2m × 5n Thus 15/1600 has a terminating decimal expansion. |
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| 7. |
If the angle subtended at the centre of a circle of radius 6 cm by an arc of length 2ℼ cm θ, then find θ/30. |
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Answer» We know that the length of an arc of a sector of angle θ = \(\dfrac{2\pi r \theta }{360} \) Using this formula, we get \(\dfrac{2\pi r \theta }{360} \) = 2π ⇒ 6θ/ 360 = 1 ∴ 6θ = 360 ∴ θ = 60° Hence, θ/30 = 60°/30° = 2° given : radius of circle(r) = 6 cm arc length(s) = 2π cm we know that, θ rad = s / r So, θ =( 2π / 6) rad = (π/3) rad = 60° Therefore , θ/30 = (60/30)° = 2°
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| 8. |
15. Simplify and express in exponential form:\[\frac{12^{3} \times 9^{4} \times 4}{6 \times 27}\] |
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Answer» I don't know.....
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| 9. |
calculate the resistivity of a copper wire of length 3m and cross section 1.8×10-5 m2 and the resistance of wire is 4×10-3 ohm |
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Answer» Given, length= 3 m Area of cross-section= 1.8×10⁻⁵ m² Resistance= 4×10⁻³ ohms Now, Resistivity = R × A / l Resistivity = 4×10⁻³ × 1.8 × 10⁻⁵ / 3 Resistivity = 4 × 0.6 × 10⁻⁸ Resistivity = 2.4 × 10⁻⁸ ohm-meter |
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| 10. |
an object of mass 25 kg is raised to a height of 6 m above the ground. what is the potential energy? if the object is allowed to fall find its kinetic energy when it is halfway down |
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Answer» Potential energy of object when at a height of 6 m : P.E. = m×g×h P.E. = 25×9.8×6 P.E. = 1470 J Kinetic Energy when the object is halfway down will be 735 Joules because the Potential Energy will be reduced to half and turned to Kinetic Energy at that time. |
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| 11. |
How many moles of Na are present in 120 g Sodium sulphate. |
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Answer» Molar mass of Sodium sulphate (Na2SO4)- = 2(23)+32+4(16) = 46+32+64 = 142 g/mol Number of moles of Na2SO4 in 120 grams of it: No. of moles = Molecular mass/ Molar mass No. of moles = 120/142 = 0.845 moles Now, in each mole of sodium sulphate, there are 2 moles of Sodium (Na). Therefore, 0.845×2 = 1.69 moles of sodium are present in 120 grams of sodium sulphate. Na2SO4(sodium sulphate) Molecular weight - 142 g/mol Number of moles of sodium sulphate = \(\frac{120g}{142g/mol} = 0.84 mole\) \(\because\) 1 molecule of Na2SO4 contains = 2 atom of sodium \(\therefore\) 0.84 mole of Na2SO4 contain = 1.68 moles sodium atom. Hence, 120 g Na2SO4 contain 1.68 moles sodium atom |
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| 12. |
calculate the work required to be done to stop a car of 1650 kg moving at a velocity of 70 km/h? |
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Answer» mass: 1650kg velocity:70km/hr v: 70×5/18 v: 19.4m/s The car is in motion,so it's energy is Kinetic energy: 1/2mv² 1/2×1650(19.4)² 310497J The KE of car ,when it come to rest: 0J WD on object=change in KE 310497-0 310497J Ans |
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| 13. |
a small child succeeds in lifting a mass of 10 kg on his head but loses balance and the object fall back to the ground if the child has a height of 90 cm find the kinetic energy with which the object strikes the ground |
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Answer» Given, Mass = 10 kg Height = 90 cm = 0.9 m Now, from 3rd equation of motion, v²-u²= 2as v² = 2×9.8×0.9+0² v² = 17.64 m/s Now, we know that, K.E. = 1/2mv² K.E. = 1/2×10×17.64 K.E. = 88.2 Joules |
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| 14. |
The earth's gravitational force causes an acceleration of 6 m/s2 in a 2 kg mass somewhere in space. how much will the acceleration of a 5 kg mass be at the same time. |
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Answer» The acceleration will remain same because it does not depend on mass of the object. Hence, the acceleration on the 5 kg object will also be 6 m/s². The acceleration due to gravity does not vary with the change in the mass of the object as it is a dimensionless quantity representing the amount of matter in a particle or object. Therefore, the acceleration of a 5 kg mass at the same place is 6m/s2. |
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| 15. |
जिंक क्या है?What is zinc? |
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Answer» Zinc is an essential trace element commonly found in red meat, poultry, and fish. It is necessary in small amounts for human health, growth, and sense of taste. |
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| 16. |
Explain the special features of Indian History. |
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Answer» India is the 7th largest country in area and the second-most populous country in the world. The special features of Indian history are: a. Continuity of civilization and culture: India has one of the earliest histories in the world. The physical features of our country, full of variety, richness and contrasts tend to divide India into different local zones. However, it has 4000 years of continuous history and continuity of civilization and culture, like China. b. Evolution in phases: Its has developed in various stages with necessary improvements. We find a connecting link of events from the Indus to the Vedic period, Vedic to Islamic and Christian influences. c. Foreign invasions: The natural barriers on the frontiers of India provided security from foreign invasions. However, foreigners like Greeks, Persians, Huns, Shakas, Arabs, Turks, Kushans, Afghans, and others entered India from the Khyber and Bolan passes. All these invaders contributed to the Indian culture. The historical monuments and other structures like forts built by these invaders are attracting tourists even today. South India had immunity from such invasions and developed a distinct culture of its own. d. Religious tolerance (dominant and tolerant Hindu faith): India is home for Hindus, Jains, Buddhists, Sikhs, Muslims, Parsis, Christians, and several tribal faiths and practices. Indians believe in the concept of ‘Vasudhaivaka kutumbakam’ and ‘Sarve janaha sukhino bhavantu’, which means that the whole world is one family and let all the people be happy. e. Indian contributions to the world: India has contributed immensely in the fields of literature, philosophy, science, art, culture, architecture, mathematics, medicine, astronomy, etc. UNO has recognized more than 30 Indian historical sites as centers of world heritage, such as the hill forts of Rajasthan, Khujaraho, Konark, Taj Mahal, Bodh Gaya, Sanchi, Ajanta, Ellora, Hampi, Aihole, Pattadakallu, Madurai, Kanchi, Churches of Goa, etc. Yoga, Ayurveda, and other artistic specimens are the special contributions of Indians to the world. The great contributions of Indian mathematicians have enriched the world with the concept of zero and the decimal system. The ancient universities of Nalanda, Takshashila, Ujjain, Prayag, Vikramshila, Kashi and Kanchi attracted students from different countries of the world. India was at the height of its intellectual and spiritual glory. f. Unity in diversity: India possesses diverse physical and geographical features and also shows diversity racially, linguistically, socially, economically, religiously and almost in every sphere of human activities. In spite of all these diversities, there are many unifying forces that have kept India united. |
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| 17. |
Write the social condition of Aryans. |
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Answer» 1. Social conditions: The early vedic people developed a highly organised society, that was based on the principle of monogamy. Polygamy was practiced-only among the royal families. The eldest male member was the head of the family and was called ‘Kulapathi’ or ‘Grihapathi’. There was no system of child marriage but widow remarriage prevailed. Marriage was considered a sacred bond and after marriage the bride lived in the house of the bridegroom. Usually a joint family system prevailed among the Aryans. 2. Social divisions: The social divisions, chati vamas were based on professions. They were Brahmana, Kshatriya, Vaishya, and Sudra. People could change professions and hence change their vamas. Thus, there was mobility among the vamas. 3. Position of the women : The status of women in the family and in the society was high and they had equal rights with men. Women were educated and highly civilized for e.g.: Gargi, Maithreyi, Apala, Ghosha, Vishwavara, and others. Girls had considerable freedom in selecting their life partners. Women freely moved out of their houses and attended public functions. A high standard of morality was maintained. 4. Food and entertainment: People consumed wheat, barley, rice, fruit, vegetables, fish and meat and intoxicating drinks like soma and sura. Aryans wore clothes made of cotton and wool. Ornaments were used by both men and women, made of gold, silver, and flowers. Gambling, chariot and horse racing, hunting and dance were the popular entertainments. Education on the whole was oral. It aimed at the development of character and was religions in nature. During the later vedic period, polygamy and polyandry came into practice. Patriarchal system still continued, and the joint family system was quite common. Women were still allowed to get higher education and participate in the religious rites. But the women were now under the protection of father or husband or a son. On the whole, position of the women had considerably come down. Varnas turned into many castes. Caste system became hereditary and very rigid. Brahmanas and Kshatriyas enjoyed a higher status compared to Vaishyas and Shudras. Life of an individual was divided into four stages called ashramas. They were Brahmacharya, Grihastha, Vanaprastha, and Sanyasa. Education was imparted by learned teachers to the students. The aim of education was to develop knowledge, character, truthfulness and devotion. Gurus enjoyed great respect. Living standard of the people was usually the same as it was in the early vedic civilization. People still lived in villages and small towns. Agriculture was the main profession of the people. |
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| 18. |
Define multiple fission. |
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Answer» Multiple fission is the reproductive cycle in which several individuals are formed or created out of the parent cell. The nucleus repeatedly divides in this method to create a huge number of nuclei. Every nucleus absorbs a little amount of cytoplasm and forms a membrane around each structure. All the daughter cells are similar and identical in dimension. The organism responsible for the multiple fission is Plasmodium. |
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| 19. |
Who wrote Buddhacharitha? |
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Answer» Buddacharita was written by Ashwagosha. |
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| 20. |
Discuss the struggle of Tippu Sultan with the British. |
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Answer» Anglo-Mysore wars (1767-1799) : 1. The first Anglo-Mysore war (1767-1769): The British after establishing supremacy in Bengal, waged war against Mysore to expand their Empire. Tippu had participated in his father’s campaigns and had gained sufficient military experience. In 1766, he fought against the Paliagars of Balam. In 1767-1769, in the first Anglo-Mysore war, he took his army towards Madras. Later, he helped his father capture the forts of Tirupattur and Vaniyambadi. 2. The second Anglo-Mysore war (1780-1784): Hyder Ali died in 1782. His son Tippu Sultan continued the war. Tippu defeated the British at Wandiwash in 1783, and marched against Mangalore and besieged the fort. Negotiations for peace started between Tippu and British through signing the treaty of Mangalore in 1784. and the second Anglo-Mysore war ended with that. 3. Third Anglo-Mysore war (1790-1792) : The third Anglo-Mysore war was again fought between Tippu Sultan and the British. Tippu’s rise caused fear and jealousy among the Britishers. Tippu was trying to get the help of the French to expel the British from India. War broke out with Tippu’s unprovoked attack on Travancore in 1789, whose ruler was an ally of the British. British Governor-General, Lord Cornwallis was waiting for a pretext to wage a war against Tippu. He formed a coalition consisting of the British, the Nizam and the Maratbas against Tippu, and attacked Sirangapattana. Tippu could not fight this combined army arid he began to lose ground. They besieged his capital Srirangapattana in 1792. Forced by circumstances, Tippu signed the most humiliating treaty of Srirangapattana in March 1792. 4. Treaty of Srirangapattana in 1792 : The terms of the treaty were:
5. Fourth Anglo-Mysore war (1798-1799): Tippu could not reconcile to the defeat and humiliation in the third Anglo-Mysore war and was determined to drive out the British from India. He again started negotiations with France, Turkey, Kabul, Afghanistan, etc. by sending his delegations but he could not get any help. Lord Wellesley forced him to sign the subsidiary Alliance, which he refused, As a result war became inevitable. Lord Wellesley sent a powerful army along with the Marathas and Nizam. Tippu was defeated in the battle of Siddeshwara and Malavalli. On fourth May 1799, the British besieged the fort of Srirangapattana. The fort was bombarded and the enemy entered the fort. Tippu died fighting in the battle and the British captured Srirangapattana. After the death of Tippu, his territories Were divided among the British, the Marathas and the Nizam. A portion of his Kingdom was given to the Wodeyars of Mysore. Krishnaraja Wodeyar – III became the King of Mysore. |
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| 21. |
If n is odd, then an + bn is divisible by (a + b) and an− bn is divisible by (a − b). If n is even, then an− bn is divisible by (a − b) and (a + b) .The remainder when 12011+22011+32011+…….+20102011 is divided by 2011 will be |
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Answer» 12011 + 22011 + 32011 +...... +20102011 = (12011 + 20102011) + (22011 + 20092011) + (32011 + 20082011) ...... (10112011 + 10002011) These terms are of the form an + bn, so they will be divided by a + b, as n = 2011 which is an odd number. Clearly, in the series a + b = 2011. Hence, the remainder is 0. |
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| 22. |
Graph of a linear equation is option:- (A) straight line (B) circle(C) parabola (D) hyperbola |
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Answer» Answer: (A) straight line |
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| 23. |
bond angle in NH3 is greater than in PH3 why |
Answer» The electronegativity of Nitrogen is much more than phosphorous. Thus the N-H bonds in NH3 are polar and the Hydrogen atoms of NH3 acquire a partially positive charge while the H atoms of PH3 remain neutral.The bond angle in NH3 is larger than, in PH3 because the P−H bonds are longer and the lower electronegativity of P permits electron-density to be displaced towards hydrogen to a greater extent than in the case of NH3. Both of these effects diminish the repulsion due to bond-pairs. |
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| 24. |
Find the middle term of the A.P. 6, 13, 20, ............. ,216 |
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Answer» The given AP is 6,13,20,........,216. First term, a = 6 Common difference, d = 13 - 6 = 7 Suppose these are n terms in the given AP. Then, an = 216 ⇒ 6 + (n - 1) × 7 = 216 [ an = a + (n-1) d] ⇒ 7(n - 1) = 216 - 6 = 210 ⇒ n - 1 = 210/7 = 30 ⇒ n = 30 + 1 = 31 Thus, the given AP contains 31 terms, ∴ Middle term of the given AP = (31 + 1/2)th term = 16th term = 6 + (16 - 1) × 7 = 6 + 105 = 111 Hence, the middle term of the given AP is 111. |
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| 25. |
Describe the achievements of Alla-Uddin Khilji. |
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Answer» 1. Allauddin Khilji (1296-1316 C.E.): Allauddin Khilji’s early name was Aligurshap. He lost his father in his boyhood and was brought up in the care of Jalaluddin. Allauddin married Jalaluddin’s daughter and was appointed as the Governor of Khara province. He was highly ambitious and aspired to become the ruler of Delhi. In 1294, he set his eyes on Devagiri. It’s ruler Ramachandradeva was defeated by him. Allauddin returned to Khara with a heavy amount of booty. Jalaluddin was unaware cf the evil intentions of Allauddin. He went to receive Allauddin with only a few unarmed guards and was murdered by the supporters of Allauddin. Thus, Allauddin became the Sultan of Delhi in 1296 C.E. Military Achievements of Allauddin: a. The conquests of North India: i. Conquest of Gujarat in 1297 C.E.: Allauddin sent Ulugh Ki an and Nazarath Khan, his generals to conquer Gujarat in 1297 C.E. Raja Karnadeva – II was defeated and he fled to Devagiri along with his daughter Devaladevi. The generals captured Kamaladevi (Queen of Karnadeva) and she was taken to Delhi and Allauddin married her. The Delhi troops plundered the rich ports of Gujarat. ii. Conquest of Ranathambore in 1301 C.E.: Allauddin turned his attention towards Ranathambore. Hamira Deva, the ruler of Ranathambore, had given shelter to a few muslims (Neo muslims) who were enemies of Allauddin. So, Allauddin invaded and took over Ranathambore. iii. Expedition on Mewar (Chittor) in 1303 C.E.: Allauddin led an expedition against Rana Ratan Singh of Chittoor (Mewar). He desired to possess Rani Padmini of Mewar, Queen of Ratan Singh, renowned for her beauty and talent. The fort of Chittor was captured with great hardship. Padmini and other rajput women committed ‘Jauhar’. Chittor was captured and Khizer Khan (son of Allauddin) was made the Governor of Chittor. v. Other conquests: Allauddin took an expedition to Malwa in 1305 C.E. Mahakaladeva, the ruler of Malwa was defeated by him. The territories of Ujjain, Mandu, Dhara, Chanderi and Jolur were subjugated to Allauddin. He became the master of the whole of north India. b. The Mongol Invasion (Raids): In 1299 C.E., Mongols attacked Delhi under Qutlugh Khwaja Frequent raids by the Mongols were a constant threat to the Empire. Allauddin and his general Malik Kafur successfully drove back the Mongols. He defeated them and imprisoned many of them. c. South Indian compaign: Allauddin turned his attention towards south India. He sent an expedition under his eminent general, Malik Kafur to conquer the south. He coveted the enormous wealth of south India and its temples. The four main southern rulers were defeated. i. Expedition to Devagiri (1306-1307 CE): Ramachandradeva, the ruler of Devagiri, had not paid tribute for nearly three years and he had given shelter to Karnadeva-II of Gujarat. For that reason, Malik Kafur raided Devagiri and defeated Ramachandradeva and collected a lot of booty. ii. Conquest of Warangal (1309 CE): The Delhi forces marched via Devagiri and attacked Telangana. Pratapa Rudradeva, the ruler of Warangal, put up a stiff resistance. However, he was defeated and he had to surrender a lot of wealth which was carried away to Delhi by Malik Kafur. iii. Expedition to Hoysalas in 1310 C.E.: Malik Kafur attacked Dwarasamudra, when Veera Ballala-III was busy interfering in the Chola politics. Malik Kafur occupied Dwarasamudra and Ballala-III was forced to plead for peace and he also accepted the sovereignty of Allauddin. iv. Conquests of Madhurai in 1311 C.E.: A civil war was raging between Sundrapandya and Veerapandya, when Malik Kafur attacked the capital of Pandyas (Madhurai) and plundered the city. The wealth looted in south India was transported to Delhi on a herd of elephants. Administrative achievements of Allauddin: a. Sultanship: Allauddin followed an independent policy towards political matters. He set up a strong central administration. He did not permit the interference by religious leaders in administrative matters. He believed in the divine rights of Kingship (Shadow of God). b. Espionage: He established an elaborate spy network, to get the information regarding all the activates of his nobles. He also tried to prevent the outbreak of rebellions within the Empire. He deprived his nobles of all pensions and endowments. He forbade social parties and secret meetings of the nobles, even in their houses. c. Prohibition of drinking: He banned the sale and the use of intoxicating drinks and drugs at Delhi. He knew that, gambling dens and drinking bouts were the breeding grounds. of sedition. d. Military reforms : The Standing army: Allauddin maintained a large standing army for maintaining internal law and order and to prevent the invasions of the Mongols. Ariz-i- Mumalik was the in charge for the appointment of soldiers. The state maintained a record of the Huliya or register of each soldier and his mount in the royal service. He also introduced the branding of horses or Dagh system. e. Revenue reforms : Allauddin introduced scientific methods of measurement of land for the assessment of land revenue. He appointed a special officer called ‘Mustakhraj’ to collect land revenue from the peasants. To check bribery and corruption among the revenue officials, their salaries were increased. Steps were taken to safeguard the peasants from the demands of corrupt revenue officials. f. Market regulation : The most remarkable of all these was an attempt to control the market prices by determining the cost of most of the essential commodities. Prices of all the articles of common use were fixed. Separate officers were appointed to regulate the market prices on a daily basis. g. Personality of Allauddin : He is renowned not only for his conquests but also for his administrative and economic reforms. He was vigorous, efficient, bold and original as a reformer. He established an absolute state, free from the control of religion. H:s resourcefulness, energy, capacity for work, his unbounded courage tempered with calculation and penetrating common sense stand out. |
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| 26. |
Sum of first n terms is 3n2 + n. Find the 22nd Term. |
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Answer» Sn = 3n2 + n S22 = 3(22)2 + 22 S22 = 1452 + 22 ∴ S22 = 1474 S21 = 3(21)2 + 21 S21 = 1344 a22 = S22 - S21 ∴ a22 = 1474 - 1344 ∴ a22 = 130 Hence, the 22nd term of A.P is 130 |
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| 27. |
Sum of first n terms is 3n2 + n. Find the 22nd term. |
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Answer» a22 = S22 - S22-1 a22 = 3(22)²+22 - [3(21)²+21] a22 = 1474 - 1344 a22 = 130 Hence the 22nd term of the AP is 130. |
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| 28. |
What happens to the gravitational force between two objects, if(i) the mass of one object is doubled? |
| Answer» Since the gravitational force between two objects is directly proportional to their masses, if the mass of one of the objects is doubled, the gravitational force between then will also get doubled. | |
| 29. |
Write the IUPAC name of following compounds |
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Answer» i) 2,3-dimethyl butane ii) 2,2,3-trimethyl butane iii) 2,2,3,3-tetramethyl butane iv) 1,3,5- trimethyl cyclohexane |
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| 30. |
Which of the following do not liberate CO2 when reacts with CH3COOHA) Na2CO3 B)NaOH C)NaHCO3 D) Both A and C |
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Answer» Option (B) is correct. Reason- When acid reacts with base (NaOH) CO2 is not released while the other two are basic salts (NaHCO3 and Na2CO3) which release CO2 on reaction with acid. |
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| 31. |
11. If the lines \( 5 x+12 y=3 \) and \( 10 x+24 y-58=0 \) are tangents to a circle, then find the radius of the circle. |
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Answer» Given tangents are- 5x + 12y = 3 ...(i) 5x + 12y = 29...(ii) The tangents are parallel in this case. Now, the chord formed by two parallel tangents of a circle is the diameter of the circle. \(d = |\frac{c_{2}-{c_{1}}}{\sqrt{a²+b²}}|\\d=|\frac{-29+3}{5²+12²}|\\d=|\frac{-26}{13}| \\d=2\) Now, d =2r r = 1 unit |
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| 32. |
A motorist covers a distance of \( 135.04 km \) in \( 3.2 \) hours. The speed of the motor is : |
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Answer» Distance covered by motorist: 135.04 km Time taken: 3.2 hours We know that, Speed = Distance/ Time Speed = 135.05/3.2 Speed = 42.203 km/hr |
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| 33. |
In the circuit given below, the current flowing across 5 ohm resistor is 1 amp. Find the current flowing through the other two resistor. |
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Answer» In the given figure, 5Ω, 4Ω and 10Ω resistors are in parallel. In parallel combination, voltage across each resistor is same. It is given that, R = 5Ω I = 1A V = IR = 5V Current across 4Ω resistor I = 5/4 A = 1.25 A Current across 10Ω resistor I = 5/10 = 0.5 A Given, Current flowing through 5 ohms resistor = 1 Ampere R1= 5 ohms, R2= 4 ohms and R3= 10 ohms Now, Potential Difference across 5 ohms resistor will be: V = I × R (By Ohm's Law) V = 1 × 5 V = 5 Volts Let the current flowing through the other two resistors be I2 and I3. Since all the resistors are connected in parallel, the potential difference across the three resistances will be same. Therefore, in R2 : V = I2 × R2 5 = I2 × 4 I2 = 5/4 = 1.25 Amperes Similarly in R3 : V = I3 × R3 5 = I3 × 10 I3 = 5/10 = 0.5 Amperes |
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| 34. |
Solve by factorization method 2x2 − 2√6x + 3 = 0 |
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Answer» = 2x²-2√6x+3=0 = 2x²-√6x-√6x+3=0 = √2x(√2x-√3)-√3(√2x-√3)=0 = (√2x-√3)(√2x-√3) = x1 = √3/√2 and x2 = √3/√2 |
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| 35. |
Check whether the following are Quadratic equations(x − 3)(2x + 1) = x(x + 5) |
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Answer» (x - 3)(2x + 1) = x(x + 5) ⇒ 2x2 - 5x - 3 = x2 + 5x ⇒ x2 - 10x - 3 = 0 It is of the form ax2 + bx + c = 0. Hence, the given equation is quadratic equation. |
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| 36. |
Two waves have intensities in the ratio 1 : 9. If these waves produce interference, then ratio of maximum and minimum intensities isA ) 3 : 1B ) 4 : 1C ) 9 : 1D ) 16 : 1 |
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Answer» The correct option is (B) 4 : 1. I1 = 1 I2 = 9 Imax = (√I2 + √I1)2 Imin = (√I2 - √I1)2 \(\frac{I_{max}}{I_{min}}=\frac{(\sqrt{I_2}+\sqrt{I_1})^2}{(\sqrt I_2-\sqrt I_1)^2}\) \(\frac{I_{max}}{I_{min}}=\frac{(\sqrt{9}+\sqrt{1})^2}{(\sqrt 9-\sqrt 1)^2}\) \(\frac{I_{max}}{I_{min}}=\frac{(3+1)^2}{(3-1)^2}\) \(\frac{I_{max}}{I_{min}}=\frac{(4)^2}{(2)^2}\) \(\frac{I_{max}}{I_{min}}=\frac{16}{4}\) \(\frac{I_{max}}{I_{min}}=\frac4{1}\) |
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| 37. |
The example of a non-ohmic resistance isA) Copper wireB) TransistorC) DiodeD) Tungsten wire |
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Answer» Correct options are:- (B) and (C) Transistors and Diodes are examples of non- ohmic resistances, as their V-I graph is constant curve. The correct option is (B) transistor and (c) Diode. A non-ohmic resistance is a resistance which does not follow the Ohm’s law. Ohm’s law states that the current through a conductor between two points is directly proportional to the voltage across the two points. The main Characteristic of Ohmic resistance is the VI curve which is a straight line. The diode does not have a straight line as a VI curve. The copper wire has a straight line as a VI graph. The filament lamp has a straight line as a VI graph. The carbon resistor has a straight line as a VI graph. So, the diode is a non-ohmic resistance. |
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| 38. |
What do you mean by mutual induction? |
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Answer» When two coils are brought in proximity with each other the magnetic field in one of the coils tend to link with the other. This further leads to the generation of voltage in the second coil. This property of a coil which affects or changes the current and voltage in a secondary coil is called mutual inductance. |
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| 39. |
In the following circuit find the potential across 4 |
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Answer» Equivalent resistance= 12ohm Total current=v/r=12/3=4A pd on 4ohm resistor=4/4=1volt |
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| 40. |
The value of current in the \( 6 \Omega \) resistance is: |
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Answer» Voltage = current * Resistance Here voltage is not Given Suppose Voltage is 30 Volt Hence current can be Calculated as Current = Voltage / Resistance = 30/ 6 Current = 5 Amp. |
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| 41. |
If \( \int \sin ^{-1} \sqrt{x} d x=x \sin ^{-1} \sqrt{x}+a \sqrt{x} \sqrt{1-x}+b \sin ^{-1} \sqrt{x}+C \) then \( 3(a-b) \) is equal to |
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Answer» If ∫ sin-1 \(\sqrt{x}\) dx = x sin-1 \(\sqrt{x}\) + a\(\sqrt{x}\) \(\sqrt{1-x}\) + b sin-1 \(\sqrt{x}\) + C \(\frac{d}{dx}\) ∫ sin-1 \(\sqrt{x}\) dx = \(\frac{x}{2\sqrt{x}\sqrt{1-x}}+sin^{-1}\sqrt{x}+a\sqrt{x}(\frac{-1}{2\sqrt{1-x}}+\frac{a}{2\sqrt{x}}\sqrt{1-x}+\frac{b}{\sqrt{1-x}}.\frac{1}{2\sqrt{x}}+0)\) ⇒ \(sin^{-1}\sqrt{x}=\frac{\sqrt{x}}{2\sqrt{1-x}}+sin^{-1}\sqrt{x}-\frac{a\sqrt{x}}{2\sqrt{1-x}}+\frac{a\sqrt{1-x}}{2\sqrt{x}}+\frac{b}{2\sqrt{x}\sqrt{1-x}}\) ⇒ \(\frac{x-ax+a(1-x)+b}{2\sqrt{x}\sqrt{1-x}}\) ⇒ x - ax + a - ax + b = 0 ⇒ x(1 - 2a) + (a - b) = 0 = or + 0 ∴ 1 - 2a = 0 and a - b = 0 ⇒ a = 1/2 & b = a = 1/2 ∴ 3(a - b) = 3 x 0 = 0 |
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| 42. |
The effect of frictional force may be minimised by providing:(1 Point)Spikes and treads in footwearLubrication to machine partsStreamlined body to the objectBoth B and C |
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Answer» Answer: Both B and C |
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| 43. |
Current density of J is flowing in a resistor of resistivity \(\rho.\) We can thus recognize \(J^2\rho\) as the |
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Answer» The answer is (3) \(J^2\rho=(\frac{I}{A})^2\times\frac{RA}{L}\) \(=\frac{I^2}{AL}.R\) = Heat generated / unit volume |
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| 44. |
अपने पक्ष को असत्य जानते हुए भी बडे-बडे महारथी अकेली निहत्थी आवाज़ को अपने ब्रह्मास्त्रों से कुचल देना चाहें तब मैं रथ का टूटा हुआ पहिया उसके हाथों में ब्रह्मास्त्रों से लोहा ले सकता हूँ।कवि ने पौराणिक प्रसंग द्वारा वर्तमान समय की चर्चा की है। इस पर अपना मत लिखें। |
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Answer» बडे-बडे व्यक्ति, महान योद्धा जानते हैं कि वह जिस ओर से लड़ रहे हैं, वह अन्यायी हैं। वे अन्यायी शासक वर्ग अपनी शक्ति और अधिकार रूपी ब्रह्मास्त्र से निरायुध व्यक्ति को कुयल देना चाहते हैं। ऐसी अवसर पर मैं रथ का टूटा हुआ पहिया मानव-मूल्य बनकर निरायुध के हाथ में आ जाता हूँ और ब्रह्मास्त्रों से लोहा ले सकता हूँ। यहाँ महारथी शोषक वर्ग का और ब्रह्मास्त्र शासक वर्ग के द्वारा शक्ति और अधिकार का दुरुपयोग का प्रतीक हैं। इस कविता में महाभारत के अभिमन्यु की कहानी को प्रतीकात्मक बनाकर वर्तमानयुग की जटिलता का चित्रण किया है। I don't know the answer
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| 45. |
अपने पक्ष को असत्य जानते हुए भी बडे-बडे महारथी अकेली निहत्थी आवाज़ को अपने ब्रह्मास्त्रों से कुचल देना चाहें तब मैं रथ का टूटा हुआ पहिया उसके हाथों में ब्रह्मास्त्रों से लोहा ले सकता हूँ।‘सामना करना’ के अर्थ में कवितांश में प्रयुक्त मुहावरा कौन – सा है? |
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Answer» सामना करना’ के अर्थ में कवितांश में प्रयुक्त मुहावरा लोहा लेना है। |
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| 46. |
अपने पक्ष को असत्य जानते हुए भी बडे-बडे महारथी अकेली निहत्थी आवाज़ को अपने ब्रह्मास्त्रों से कुचल देना चाहें तब मैं रथ का टूटा हुआ पहिया उसके हाथों में ब्रह्मास्त्रों से लोहा ले सकता हूँ।अकेली निहत्थी आवाज़ किसकी है? |
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Answer» निरायुध व्यक्ति की है। जिस केलिए संसार में कोई बड़ा स्थान या धन नहीं। |
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| 47. |
A stone thrown at an angle `theta` to the horizontal reaches a maximum height h. The time of flight of the stone is :-A. `(sqrt(2h sin theta))/(g)`B. `(2 sqrt(2h sin theta))/(g)`C. `2 sqrt((2h)/(g))`D. ` sqrt((2h)/(g))` |
| Answer» Correct Answer - A | |
| 48. |
A body is projected from ground with speed 20 m/s making an angle of `45^(@)` with horizontal. The equation of path is `h = Ax-Bx^(2)`, where h is height, x is horizontal distance, A and B are constant. The ratio A : B is :- `(g = 10 m//s^(2))`A. 1 : 5B. 5 : 1C. 1 : 40D. 40 : 1 |
| Answer» Correct Answer - A | |
| 49. |
Calculate number of electrons present in 3.5 g of PO :-A. 6B. `5 N_(A)`C. `0.1 N_(A)`D. `4.7 N_(A)` |
| Answer» Correct Answer - A | |
| 50. |
factorise a square minus 10 A + 25 |
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Answer» a square-10a + 25 a square-5a - 5a + 25 a(a-5) -5 (a-5) (a-5) (a-5) |
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