Science & Technology mcqs#2

Q 1.Recombinant DNA technology (Genetic Engineering) allows genes to be transferred

1. across different species of plants

2. from animals to plants

3. from microorganisms to higher organisms

Select the correct answer using the codes given below.

 1 only

 2 and 3 only

 1 and 3 only

 1, 2 and 3

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Q 2.Consider the following:

1. Electromagnetic radiation

2. Geothermal energy

3. Gravitational force

4. Plate movements

5. Rotation of the earth

6. Revolution of the earth

Which of the above are responsible for bringing dynamic changes on the surface of the earth?

 1, 2, 3 and 4 only

 1, 3, 5 and 6 only

 2, 4, 5 and 6 only

 1, 2, 3, 4, 5 and 6

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Q 3.Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as aflatoxins which are not generally destroyed by normal cooking process. Aflatoxins are produced by

 bacteria

 protozoa

 moulds

 viruses

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Q 4.Which of the following diseases can be transmitted from one person to another through tattooing?

1. Chikungunya

2. Hepatitis B

3. HIV-AIDS

Select the correct answer using the codes given below.

 1 only

 2 and 3 only

 1 and 3 only

 1, 2 and 3

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Q 5.Consider the following minerals

1. Calcium

2. Iron

3. Sodium

Which of the minerals given above is/are required by human body for the contraction of muscles?

 a.1 only

 b.2 and 3 only

 c.1 and 3 only

 d. 1, 2 and 3

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Q 6.Fruits stored in a cold chamber exhibit longer storage life because

 a.exposure to sunlight is prevented

 b.concentration dioxide in the is increased of carbon environment

 c.rate of respiration is decreased

d. there is an increase in humidity

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Q 7.Ball bearings are used in bicycles, cars, etc., because

 a.the actual between the is increased area of contact wheel and axle

b.the effective between the is increased area of contact wheel and axle

 c.the effective between the is reduced area of contact wheel and axle

d. None of the above statements is correct

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Q 8.Consider the following phenomena:

1. Size of the sun at dusk

2. Colour of the sun at dawn

3. Moon being visible at dawn

4. Twinkle of stars in the sky

5. Polestar being visible in the sky

Which of the above are optical illusions?

 a.1, 2 and 3

 b.3, 4 and 5

 c.1, 2 and 4

d. 2, 3 and 5

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Q 9.Rainbow is produced when sunlight falls on drops of rain.

Which of the following physical phenomena are responsible for this?

1. Dispersion

2. Refraction

3. Internal reflection

Select the correct answer using the codes given below.

a. 1 and 2 only

 b.2 and 3 only

 c.1 and 3 only

d.1, 2 and 3

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Q 10.Many transplanted seedlings do not grow because

 a.the new soil does not contain favourable minerals

 b.most of the root hairs grip the new soil too hard

 c.of the root hairs are lost during transplantation

 d.leaves get damaged during transplantation.

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