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The correct option is. (A)

Explanation:

Quarks have fractional electric charge values– either 1⁄3 or 2⁄3 times the elementary charge.

The positron has an electric charge of +1e, a spin of 1/2, and has the same mass as an electron.

A neutrino is an electrically neutral, weakly interacting elementary subatomic particle with half-integer spin. All evidence suggests that neutrinos have mass but that their mass is tiny even by the standards of subatomic particles. Their mass has never been measured accurately.

Photon has zero mass and rests energy

(a) oxygen forms stronger hydrogen level than sulphur.

Explanation:

H₂O has intermolecular hydrogen bond between its molecules (H—O—H------H—O—H) while H₂S has weak Van der Waals forces between it's molecules. Hence the molecules of H₂O are strongly packed than H₂S, thus water is at liquid state at room temperature.

(d) Phosphor bronze 

Explanation:

Phosphor bronze is used for manufacture of springs and suspension filaments in electrical instruments.

(c) For a convex lens, if the object is placed between the focus and optical centre than the image formed will be diminished.

Explanation:

(a) Light from sun takes nearly eight minutes 20 seconds to come to earth. 

(b) The image formed by a convex lens when the object is placed between the focus and the optical centre is virtual and magnified. 

(d) Cinematography makes use of persistence of vision. Persistence of vision is the ability of an eye to continuing to see the image of an object for very short duration even after the removal of the object.

Farm labourers are ill-paid in India because of the lack of alternative employment opportunities. There are a lot of unskilled labourers in rural areas of India who all compete for jobs as farm labourers. They cannot do any other job either because jobs are not available or they do not have the required skills. Therefore, there is intense competition for farm labour jobs which pushes down wages in this sector.

(d) Proliferation of space debris in low earth orbit. 

The Kessler syndrome (also called the Kessler effect, proposed by the NASA scientist Donald J. Kessler in 1978, is a scenario in which the density of objects in low Earth orbit (LEO) is high enough that collisions between objects could cause a cascade—each collision generating space debris which increases the likelihood of further collisions. One implication is that the distribution of debris in orbit could render space exploration and even the use of satellites, unfeasible for many generations.

The correct option is: (a) 1 only

Explanation:

GSLV Mk-3 is the latest version of GSLV. It can carry up to 4500 to 5000 kg satellites. Until now, India relied on EU’s Arianespace launch vehicle to send those INSAT-4 satellites. It will consist of 3 stages. 1st stage will have solid propellant, 2nd stage will have liquid propellant and 3rd stage will be cryogenic engine. GSLV MK-3 will make ISRO a competitive player in commercial launches of foreign satellites.

(d) All the above

(d) None of the above

GSLV is three staged vehicles equipped with solid propellant at first stage, liquid at second and cryogenic engine at third and PSLV is 4 marked by alternate solid and liquid busters.

The correct option is:(c) 4 1 3 2

Explanation:

Selaginella bryopter is, a lithophytic plant, is used as a medicinal plant in India and commonly known as 'Sanjeevani' or one that infuses life. It is very much drought hardy and can remain alive for many years without water. Adiantum is the maidenhair fern. Equisetum or horsetail is a living fossil and the only living genus of class Equisetopsida. Dryopteris is commonly known as wood fern or male fern.

The correct option is:(b) 1 and 2 only

Explanation:

Bryophytes are the phylum of small simple plants with no vascular tissue and root-like rhizoids. They are called the amphibians of the plant kingdom as they can survive in both conditions with and without water. Selaginella is an example of Pteridophyte.

The correct option is:(a) 1 only

Explanation:

In the leaves, the photosynthates or sugars are converted into starch and via phloem their transport to all the other parts occur. The xylem cells transport only water and some minerals from the roots up to the shoots. The xylem vessels are dead cells with empty lumen but they are hard to carry out the water transport by depositing secondary wall materials, such as lignin.

The correct option is : (b) 2 only

Explanation:

Lichens are the symbiotic association of algae and fungi. The algal member is generally a green alga or blue-green alga. The fungal partner is usually of Ascomycota. Lichens are sensitive to pH change, thus making them good indicators of pollution or SO₂ as the later makes H₂SO₄ with water

Let the number be x. 

x - 7 = 12

x = 12 + 7

x = 19

Therefore the number is 19.

The ratio of weight (load) lifted by a machine to the force(effort) applied on a machine is called the mechanical advantage of the machine.  Greater the value of mechanical advantage of a machine, more easier is the work is done. Mathematically, 

M.A = load/effort 

OR 

M.A = W/P 

UNIT: It has no unit.

Electric arc, continuous, high-density electric current between two separated conductors in a gas or vapour with a relatively low potential difference, or voltage, across the conductors. The high-intensity light and heat of arcs are utilized in welding, in carbon-arc lamps and arc furnaces that operate at ordinary air pressure, and in low-pressure sodium-arc and mercury-arc lamps.

A Zener diode, when used in voltage stabilization circuits, is biased in the reverse breakdown region.

For Zener diode,

Voltage remains constant in break down region and current-carrying capacity in high

The correct option is: (a) 1 only

Explanation:

Androecia contain stamens and gynoecia contain carpels. The calyx and corolla are the accessory reproductive organs. Corolla is the whorl of petals around the male and female reproductive organs. Corolla is the outermost whorl of sepals, which persist after fertilization and fruit development.

(a) they draw more current which is inversely proportional to the voltage.

Electronic motors draw more current which is inversely proportional to the voltage, therefore, more heat H = I²Rt is generated.

The correct option is: (b) increase

Explanation:

If the doors of a refrigerator are left open for a few hours, the room temperature will increase as the system release heat to the surroundings.

Statistics concerns with the collection of data, organisation, interpretation, analysis and the data presentation. The main purpose of using statistics is to plan the collected data in terms of the experimental designs and statistical surveys. Statistics is considered as a mathematical science that works with the numerical data. In short, statistics is a crucial process, which helps to make the decision based on the data.

Branches of Statistics: 

The two main branches of statistics are:  

• Descriptive Statistics
• Inferential Statistics 

Descriptive Statistics – Through graphs or tables or numerical calculations, descriptive statistics uses the data to provide the descriptions of the population.

Inferential Statistics – Based on the data sample taken from the population, inferential statistics makes the predictions and inferences.  Both types of statistics are equally employed in the field of statistical analysis.

Characteristics of Statistics:

The important characteristics of Statistics are as follows:  

• Statistics are numerically expressed.
• It has an aggregate of facts
• Data are collected in systematic order 
• It should be comparable to each other
• Data are collected for a planned purpose

Food processing and preservation are two techniques that are used to maintain the quality and freshness of foods. In terms of how they are performed, food processing and preservation are different; food preservation is just part of the entire procedure of processing foods. Food processing mostly involves both packaging and preservation, while food preservation is concerned with the control and elimination of the agents of food spoilage. Additionally, food processing is performed to turn food into something that is more palatable and convenient to eat. There are various methods of food preservation, which include the addition of chemicals, dehydration, and heat processing.

Correct option : (C) Capacity  

Modernisation Improves Capacity.

Purpose

A story is narration of a set of fictitious events often used to convey a moral message.

Format

• Context- Use phrases like- 'Once upon a time…‘, 'It happened so…‘, 'Longlong ago…‘
• Introduction of characters- through dialogues or narration.
• Plot- Description of an event/accident
• Climax- end of the story, Most interesting, Unpredictable

Steps

• Set the context
• Introduce characters
• Develop plot(s)
• Reach climax
• End the story

(a) water starts boiling at a lower temperature due to high pressure.

Because water starts boiling at a lower temperature due to high pressure. According to Gay-Lussac’s law r ∝ T.

The correct option is: (d) All

The correct option is: (d) Tamil Nadu

The correct option is: (a) 1, 2 and 3

The correct option is: (b) Both 1 and 2

Explanation:

Kiran MK 11: Aerobatic aircraft 

MI 35: Attack helicopter 

Mirage 2000 is a jet fighter aircraft

The correct option is: (a) Gulmarg

Explanation:

The High Altitude Warfare School (HAWS) is located at Gulmarg (Jammu and Kashmir). It was set up in 1948 by the Indian Army to train its personnel high altitude warfare, counterintelligence and survival.

The correct option is: (c) 3, 2, 1 and 4

(b) Phalcon : Cruise missile supplied by Russia to India

Phalcon is radar system provided by Israel to India.

A DR (Depositary Receipt) are issued in a bank representing shares in a foreign company traded on a local stock exchange.

The correct option is: (a) dormancy

The correct option is: (d)

Here's a list of agreements signed by India and China:

• Protocol for establishment of consulates in Chengdu and Chennai 
• Cooperation in vocational education and skill development and setting up of Mahatma Gandhi institute on skill development in India 
• Consultative mechanism on cooperation in trade negotiations 
• Cooperation between Foreign Ministry and and Central Committee of Communist Party of China (CCCPC) 
• Action plan between national railway administration of China and Indian Railways 
• Memorandum of Understanding on education exchange programme 
• Cooperation in the fields of mining and minerals 
• Space cooperation outline 
• Safety regulations on importing Indian rapeseed meal 
• Broadcasting agreement between CCTV and Doordarshan 
• Agreement for cooperation in the field of tourism 
• Memorandum of Understanding on establishing India-China think tanks forum 
• Memorandum of Understanding between NITI Aayog and Development Research Centre 
• Memorandum of Understanding on cooperation in earthquake science and engineering 
• Memorandum of Understanding on cooperation in ocean sciences, climate change and cryosphere 
• Memorandum of Understanding on cooperation in geo sciences 
• Memorandum of Understanding on establishment states/provincial leaders' forum 
• Cooperation between states and municipalities - establishment of India-China state leaders forum 
• Agreement on the establishment of sister states Sichuan and Karnataka 
• Agreement on the establishment of sister cities between Chennai and Chongqing 
• Agreement on the establishment of sister cities between Hyderabad and Gingdao 
• Agreement on the establishment of sister cities Aurangabad and Dunhuang 
• Memorandum of Understanding between ICCR and Fudan University for establishment of centre for Gandhian studies 
• Memorandum of Understanding for the establishment of Yoga college in Kumning

Here's a list of agreements signed by India and China:

• Protocol for establishment of consulates in Chengdu and Chennai 
• Cooperation in vocational education and skill development and setting up of Mahatma Gandhi institute on skill development in India 
• Consultative mechanism on cooperation in trade negotiations 
• Cooperation between Foreign Ministry and and Central Committee of Communist Party of China (CCCPC) 
• Action plan between national railway administration of China and Indian Railways 
• Memorandum of Understanding on education exchange programme 
• Cooperation in the fields of mining and minerals 
• Space cooperation outline 
• Safety regulations on importing Indian rapeseed meal 
• Broadcasting agreement between CCTV and Doordarshan 
• Agreement for cooperation in the field of tourism 
• Memorandum of Understanding on establishing India-China think tanks forum 
• Memorandum of Understanding between NITI Aayog and Development Research Centre 
• Memorandum of Understanding on cooperation in earthquake science and engineering 
• Memorandum of Understanding on cooperation in ocean sciences, climate change and cryosphere 
• Memorandum of Understanding on cooperation in geo sciences 
• Memorandum of Understanding on establishment states/provincial leaders' forum 
• Cooperation between states and municipalities - establishment of India-China state leaders forum 
• Agreement on the establishment of sister states Sichuan and Karnataka 
• Agreement on the establishment of sister cities between Chennai and Chongqing 
• Agreement on the establishment of sister cities between Hyderabad and Gingdao 
• Agreement on the establishment of sister cities Aurangabad and Dunhuang 
• Memorandum of Understanding between ICCR and Fudan University for establishment of centre for Gandhian studies 
• Memorandum of Understanding for the establishment of Yoga college in Kumning

The correct option is (B) 550 cal/g.

Assuming heater is supplying heat at uniform rate of Q cal/ s in 10 minutes total heat transferred = 600 x Q 

This amount should be equal to heat gained by water = mcΔT where m is mass of water and c is specific heat capacity of water. 

mcΔT = 600Q 

m x 1calg^-1 C^0-1 × (100 − 0) = 600Q 

⇒ Q = m/6 ...(i) 

The heater supplies heat at constant temperature to convert water into steam, the amount of heat is given by 

55 minutes x 60 x sec x ˙ Q ..(i) 

this amount should be equal to heat gained by water to convert into steam at constant temperature = mL where L is latent heat of vaporization 

3300Q = mL ...(ii) 

substituting value of Q from equation (i) 

3300 m/6 = mL 

L = 550 cal/g

Households that earn more than Rs 1,00,000 per year = 22%  

Households that earn more than Rs 2,00,000 per year = 6%  

So,  Households that earn between Rs 1,00,000 and Rs 2,00,000 per year = 22 - 6 = 16%  

Now, Households that earn less than Rs. 30,000 per year = 12%  

Households that earn between Rs 30,000 and Rs 1,00,000 per year = 100 - (22 + 12) = 66% = 990  

So, 100% = 990 × (100/66) = 1500  

So, households that earn between Rs 1,00,000 and Rs 2,00,000 per year  = 16% = (16/100) × 1500 = 240

The correct option is:(d) 1, 2 and 3 are correct

Explanation:

Sound waves require material medium to travel. On the surface of the moon, there is no atmosphere. The speed of sound is maximum in solids and minimum in gas medium.

The correct option is: (c) A is true, but R is false.

Explanation:

A diamond sparkles more than a glass imitation cut to the same shape is only the true statement. The refractive index of diamond 2.42 > glass 1.5.

The correct option is: (b) dispersion and diffraction

Explanation:

Rainbow is a spectrum of seven colours— VIBGYOR. It is formed on account of dispersion and total internal reflection. 

(d) our perspiration evaporates rapidly

A fan produces a feeling of comfort during hot weather because our perspiration evaporates rapidly. Evaporation process takes surroundings temperature.

These language barriers include differences in: knowledge and skill level, the use of slang and local parlances, speech disabilities, deaf and/or hard-of-hearing callers, the caller not being able to speak at all, or speaking in code.

Here, A is CH₃MgBr.
As the reaction goes as,
HCHO + CH₃MgBr → CH₃CH₂OMgBr + H₂O → CH₃CH₂OH + Mg(OH)Br

(a) True

(b) True

(c) True

(d) False.

The correct option is: (A)

Explanation:

Goldstein discovered proton, ChadwickNeutron, J. J. Thomson- Electron and John DaltonAtomic Theory.

The correct option is: (b) 2, 3, and 4

Explanation:

Diamond is an allotrope of carbon not silicon

The correct option is:(a) 1, 3 and 4

Explanation:

Diamond, an allotrope of carbon, has very high refractive because of which it is used as a gem in jewellery. It is used for cutting glass, marble stones and other hard materials and for drilling of rocks. It is a bad conductor of electricity. It is the hardest material known.

(a) A – (q); B – (r); C – (p)