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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 8901. |
Choose the correct statement from the following. Platinum occurs in free state. Platinum is a least reactive metal. Platinum turns into vapour at low temperatures. |
| Answer» SOLUTION :PLATINUM is a LEAST REACTIVE METAL. | |
| 8902. |
Define cancer. |
| Answer» SOLUTION :Cancer is an abnormal and uncontrolled division of cells that INVADE and DESTROY surrounding tissue forming a tumor or neoplasm. It is a HETEROGENOUS group of cells that do not respond to the normal cell division. | |
| 8903. |
A bullet of mass m moving with a speed v strikes a wooden block of mass M & gets embedded into the block. The final speed is |
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Answer» `sqrt((M)/(M+n))V` mv+M(0)=(m+M)V `V=(mv)/(m+M)` |
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| 8904. |
Calculate the amount of charge flowing in a wire if it draws a current of 2 A in 10 minutes. |
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Answer» Solution :Current = 2A Time = 10 minutes = `10xx60=60` seconds CHARGE [Q] = current [i] `XX` Time [T] `Q=2xx600=1200C` |
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| 8905. |
Vishva noticed in a dhaba around 50 bulbs, each of 100 W all were glowing. She calculated the cost of electricity consumed in one hour and told the dhaba owner to reduce the expenses and at the same time save electricity by using CFL bulbs instead of ordinary filament-type bulbs. What value did Vishva display in the above case? |
| Answer» SOLUTION :Vishva displayed responsible BEHAVIOUR, awareness as a CITIZEN, critical thinking and ANALYSIS. | |
| 8906. |
Observe and Discuss. Study the model depicting the construction of human eye with the help of teachers. |
| Answer» SOLUTION :[STUDENTS are EXPECTED to PERFORM the above ACTIVITY on their own.] | |
| 8907. |
Vishva noticed in a dhaba around 50 bulbs, each of 100 W all were glowing. She calculated the cost of electricity consumed in one hour and told the dhaba owner to reduce the expenses and at the same time save electricity by using CFL bulbs instead of ordinary filament-type bulbs. What is a CFL? |
| Answer» SOLUTION :A CFL is a COMPACT FLUORESCENT LAMP. | |
| 8908. |
What do you observe in the following pictures? |
Answer» SOLUTION :The given pictures SHOW the use and EFFECTS of electric CURRRENT. 
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| 8909. |
prepare a list of five items that you use daily in the school. Identify from the list such items that can be recycled. |
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Answer» Solution :paper,rexine bag,blade,PEN,plastic box,scale,ERASER,compass and DIVIDER(metallic),STEEL lunch box and steel spoon are used in the school. paper,blade,plastic box,eraser,compass,steel lunch box and steel spoon can be RECYCLED |
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| 8910. |
Vishva noticed in a dhaba around 50 bulbs, each of 100 W all were glowing. She calculated the cost of electricity consumed in one hour and told the dhaba owner to reduce the expenses and at the same time save electricity by using CFL bulbs instead of ordinary filament-type bulbs. What would be the cost of electric energy if 50 bulbs, each of 100 W. are used for one hour? 1 unit costs Rs 5. |
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Answer» Solution :The COST of ELECTRICITY consumed when 50 bulbs are used for 1 hour =(NUMBER of units consumed) `xx` RS 5 per unit `= (50 xx 100/1000 kW xx1 H) xx (Rs 5)/(1 "unit")` `= (5kWh) xx(Rs 5)/(1 "unit")` `= Rs 25` |
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| 8911. |
Endoskeleton of Cyclostomata animals is …………… . |
| Answer» SOLUTION :ENDOSKELETON of CYCLOSTOMATA ANIMALS is CARTILAGINOUS. | |
| 8912. |
A largeforce actingfor a very short interval of time is called __________. |
| Answer» SOLUTION :impulsiveforce | |
| 8913. |
The calorific value of hydrogen is 1,50,000 Kj//Kg and that of LPG is 55,000 KJ//Kg. What do you mean by calorific value? |
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| 8914. |
The energy of a system as a function of time t is given as E (t) = A^2 exp (- alpha t), where alpha = 0.2 s^(-1). The measurement of A has an error of 1.25%. If the error in the measurement of time is 1.50%, the percentage error is the value of E = (t) at t= 5 sec is |
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Answer» 0.01 |
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| 8915. |
The acceleration a in ms^-2 of a particle is given by a=3t^2+2t+2, where t is the time. If the particle starts out with a velocity v=2ms^-1 at t=0, then find the velocity at the end of 2s. |
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Answer» Solution :`a=(dv)/(DT)=(3t^(2)+2t+2)dt` `dv=(3t^(2)+2t+2)dt` `int dv=int (3t^(2)+2t+2)dt` `v=t^(3)+t^(2)+2t+C` `c =2m//s, v=18 m//s" at " t=2s`. |
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| 8916. |
AIDS, T.B., Leprosy, Yoga. |
| Answer» SOLUTION :YOGA as others are incurable DISEASES bad for HEALTH while, yoga leads to good health. | |
| 8917. |
A block and tackle has two pulleys in each block, with the tackle tied to the hook of the lower block and the effort being applied upwards. (a) draw a neat diagram to show this arrangement and calculate its mechanical advantage. (b) If the load moves up a distance x, by what distance will the fre end of the string move up ? |
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Answer» SOLUTION :(a) The arrangement is shown in Figure. Here the load is being supported by FIVE segments of the STRING. Therefore, L=5T and E=T `therefore M.A.=(L)/(E)=(5T)/(T)=5` (b) If the load moves up a distance x, the free end of the string will move up by a distance 5x.  .
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| 8918. |
Which of the following frequencies of sound cannot be heard by human beings? |
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Answer» 5 Hz |
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| 8919. |
Cell phone towers should be placed far away from the residential area-why? |
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Answer» Solution :(i) Living near cell phone tower is not HEALTHY. There are multiple health risk ASSOCIATED with living near cell phone tower. (ii) Cell phone towers COMMUNICATE by use pulsed microwave signals (radiofrequency radiation) with each other. (III) That is the reason cell phone towers should be placed FAR away from the residential area. |
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| 8920. |
Which of the following best explains electromagnetic induction ? |
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Answer» charing of an electric conductor |
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| 8921. |
Calculate the amount of heat energy to be supplied to convert 5 kg of ice at0^(@)C completely into water at0^(@)C if latent heat of melting ice is 80 cal/g. |
| Answer» SOLUTION :400 KCAL | |
| 8922. |
State the laws of refraction of light. Explain the term absolute refractive index of a meidum and write an expression to relate it with the speed of light in vaccum. |
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Answer» Solution :Two basic laws of refraction of light are : (i) The incident ray, the refracted ray and the normal to the separating surface at the point of incidence, all lie in the same plane. (ii) The ratio of sine of the angle of incidence (i) to the sine of angle of refraction (r) is a constant. It is known as Snell.s law. THUS, according to Snell.s law `(sin i)/(sin r) = a` constant = n Generally, the constant n is known as the absolute refractive index of given MEDIUM. Thus, absolute refractive index of a medium is defined as the ratio of sine of angle of incidence of a light ray in AIR (or vaccum) to the sine of angle of refraction of the ray in given medium. Absolute refractive index of a medium is a unitless quantity and its value is one or greater than one. In terms of SPEED of light, the absolute refractive index of a medium is defined as : Absolute refractive index of a medium (n) `= ("Speed of light in vacuum (or air) .c.")/("Speed of light in given medium .V.")` 
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| 8923. |
A student suggested the following 'guidelines' to his friend for doing the experiment on tracing the path of a ray of light passing through a rectangular glass slab for three different angles of incidence : A. Draw the 'outline' of the glass slab at three positions on the drawing sheet. B. Draw 'normals' on the top side of these 'outlines' very near their left end. C. Draw the incident rays on the three 'outlines' in directions making angles of 30^(@), 45^(@), 60^(@) with the normals drawn. D. Fix two pins vertically on each of these incident rays at two points nearly 1 cm apart. E. Look for the images of the 'heads' of these pins while fixing two pins from the other side, to get the refracted rays. When he showed these 'guidelines' to his teacher, the teacher corrected and modified the 'guidelines' labelled as |
| Answer» Solution :NA | |
| 8924. |
Make a list of three features due to which L.P.G is considered to be a good fuel ? |
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Answer» Solution :(i) RELEASES large amount of energy on burning (II) Easy to store (iii) Easy to transport (IV) Does not produce smoke (v) ENVIRONMENT FRIENDLY |
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| 8925. |
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be- |
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Answer» Solution :`P=V^(2)/RtoR=V^(2)/P=(220xx220)/100=484Omega` `P=V^(2)/R=(110xx110)/484=25W`. |
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| 8926. |
a) How does construction of dams across the river get linked with production of green house gases? b) How do techological inputs improve the efficiency of biomass fuel? |
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Answer» SOLUTION :a) A vast variety of plants get submerged in WATER, ROT under anerobic conditions and produce large amount of green house gases such as methane. b) Traditional USES of biomass fuels are not only efficient but they also produce a lot of pollutants which are hazardous to health . THEREFORE , techonological input are necessary to improve the efficiency of these fuel and make them enivironment friendly, With the help of technology smokeless chulhas and biogas plants have been designed. |
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| 8927. |
A body is acted upon by two forces each of magnitude F, but in opposite directions. State the effect of the forces if (a) both forces act at the same point of the body. (b) the two forces act at two different points of the body at a separation? |
| Answer» Solution :Resultant force=0 MOMENT of forces =0, no forces =Fr. The forces TEND to rotate the BODY about the mid point between the two forces | |
| 8928. |
Define absolute refractive index of a medium. Light enters from air to water having refractive index 4/3 . Find the absolute refractive index of a medium if the speed of light in vacuum is 3xx10^(8) m/s. |
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Answer» SOLUTION :Absolute refractive index of a medium `=("Velocity of LGIHT in vacuum")/("Velocity of light in medium")` `v=c/n=(3x10^(8))/4=2.25xx10^(8)m//s` |
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| 8930. |
A car travelling with a velocity of 50 km h^-1 on a straight road is ahead of a motor-cycle travelling with a speed of 75 kmh^-1. How would the relative velocity be altered if motor cycle is ahead of car ? |
| Answer» SOLUTION :No CHANGE | |
| 8931. |
When Newton's colour disc rotates fast it appears white, Write another example related to this? |
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| 8932. |
The mass of moon is nearly 10% of the mass of the earth. What will be the gravitational force of the earth on the moon, in comparison to the gravitational force of the moon on the earth? |
| Answer» Solution :Both forces will be EQUAL in MAGNITUDE as gravitational FORCE is a mutual force between the TWO BODIES. | |
| 8933. |
A block having mass m collides with another stationary block having mass 2m. The lighter block comes to rest after collison. If the velocity of first block is V, then the value of co-efficient of resitution will be |
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Answer» 0.5 `mV=2mV^(1)impliesV^(1)=V/2` `e=("VEL. of separation")/("Velocity of APPROACH")=0.5` |
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| 8934. |
Read the following paragraph and answer the questions. If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. Which property of the substance is measured using this principle? |
| Answer» SOLUTION : Specific HEAT CAPACITY of object is measured USING this principle. | |
| 8935. |
Read the following paragraph and answer the questions. If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. How will you state the principle briefly? |
| Answer» Solution :As inside the heat RESISTANT BOX, the heat lost by hot object exactly equals heat gained by cold object, principle of heat EXCHANGE is stated as: In an isolated SYSTEM, Heat lost by hot object = Heat gained by cold object. | |
| 8936. |
Read the following paragraph and answer the questions. If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. Which principle do we learn about from this process? |
| Answer» SOLUTION :PRINCIPLE of HEAT EXCHANGE. | |
| 8937. |
Read the following paragraph and answer the questions. If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. i. Heat is transferred from where to where? |
| Answer» SOLUTION : Heat is transferred from hot OBJECT to COLD object. | |
| 8938. |
What is meant by saying that the potential difference two points is 1V? |
| Answer» Solution :The potential difference between two points is said to be 1 volt, if 1 joule of work is to be done for moving a charge of 1 coulomb from ONE POINT to ANOTHER. | |
| 8939. |
What symptoms of mental illness re found in a person affected by stress ? |
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Answer» Solution :i. A person under stress is USUALLY FOUND indulging in destuctive and unnatural activities. ii. ALSO presons who are mentally ill are violved in domestic violence, try to commit sucide, send massages to other before committing sucide, make video clips of sucidal acts, etc. iii. Such people carry out various activaties in ORDER to GAIN the sympathy and attention of other people. |
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| 8940. |
Hobbies to reduce stress |
| Answer» Solution :To listen to music (2 ) BIRD watching and NATURES TRAILS (3) Reading good BOOKS | |
| 8941. |
Define acids. Explain two chemical properties of an acid and write the chemical equation for one example of each property. |
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Answer» Solution :Acids are COMPOUNDS, which give `H^(+)` ions in their aqueous solutions. Chemical Properties : (i) Acids react with bases to form salt and water (Neutralisation reaction). `HCl + NaOH RARR NaCl + H_(2)O` (ii) Dilute acids react with METALS to release `H_(2)` gas. `ZN + 2HCl(aq) rarr ZnCl_(2)+ H_(2)` |
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| 8942. |
Social health involves your ability to form satisfying interpersonal relationships with others. It also relates to your ability to adapt comfortably to different social situations and act apperopriately in a variety of settings. Spouses, co-workers and acquaintances can all have healthy relationships with one another. Each of these relationships should include strong communication skills, empathy for others and a sense of accountability. In contrast, traits like being withdrawn, vindictive of selfish can have a negative impact on your social health. Overall, stress can be one of the most significant threats to healthy relationship. Stress should be managed thruough proven techniques such as regular physical activity, deep breathing and positive self-talk. What is the significant threat to social health of an adolescent in your opinion? |
| Answer» Solution :General stress, addictions, WRONG peer pressure, too MUCH of screen time LACK of parental care are threats to social HEALTH of an adolescent. | |
| 8944. |
On a 60 km track, a train travels the first 30 km with a uniform speed of 30 kmh^(-1). How fast must the train travel the next 30 km so as to average 40 kmh^(-1) for the entire trip ? |
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Answer» Solution :`V_("AVG")=(S_(1)+S_(2))/(t_(1)+t_(2))=(S+S)/(S((1)/(V_(1))+(1)/(V_(2))))=(2V_(1)V_(2))/(V_(1)+V_(2))` or `40=(2xx30xx v_(2))/(V_(1)+V_(2)) rArr V_(2) =60 KMH^(-1)` |
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| 8945. |
Solve this equation for alpha-decay. ""_(88)Ra^(226) to Rn +………. |
| Answer» Solution :`""_(88)RA^(226) to ""_(86)RN^(222)+""_(2)He^(4)` | |
| 8946. |
When a person falls freely under the action of graivty has __________. |
| Answer» SOLUTION :ZERO WEIGHT | |
| 8947. |
State whether the following statements are true or false : (a) A generatorworks on the principle of electromagnetic induction. (b) A motor on the principle of electromagnetic induction. |
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| 8948. |
Atmospheric refraction advances sunrise and delays sunset by |
| Answer» Solution :2 min | |
| 8949. |
In what respect does the construction of an AC generator differ from that of a DC generator? |
| Answer» SOLUTION :The only difference between a DC generator and an AC generator is in the way the two ends of the generator coil are connected to the outer circuit. In a DC generator, the two ends of the generator coil are connected to a split ring type COMMUTATOR consisting of two half RINGS of COPPER. In an AC generator, the ends of the coil are connected to two full rings of copper called slip rings. There is no commutator in an AC generator. | |
| 8950. |
Name any two materials used for making solar cells. |
| Answer» SOLUTION :(i) Sillicon (II) GALLIUM or SELENIUM. | |