Prelims MCQs Quiz 42 : Science


1.Which of the following is/are cross-linked polymer?
1. polythene
2. nylon
3. Bakelite
Select the correct answer using the codes given below.
a) 1 and 3 only
b) 3 only
c) 2 and 3 only
d) 1, 2 and 3

Answer & Explanation

2. With reference to Low Earth Orbits (LEO), consider the following statements:
1. Satellites in LEO suffer high atmospheric drag compared to those in geostationary orbit.
2. Satellites in LEO have high dwell time over a particular area.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

3. Human bodies can be scanned with Magnetic Resonance Imaging (MRI) because they contain
a) carbon
b) oxygen
c) hydrogen
d) iron

Answer & Explanation

4. In a closed system, between the system and environment, there is no exchange of
1. Matter
2. Energy
3. Heat
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 1 and 3 only
d) 1, 2 and 3

Answer & Explanation

5. With reference to an inverter, consider the following statements:
1. An inverter is a device that converts alternating current to direct current.
2. An inverter is fitted in the main power line.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

6. If we cannot see a black hole (even with a telescope), then how are they detected?
1. by studying the behaviour of objects around them.
2. calculating the value of red shift.
3. detecting the gravitational lens effect.
4. detecting the emitted radiation.
Select the correct answer using the codes given below.
a) 1 and 3 only
b) 1, 3 and 4 only
c) 3 and 4 only
d) 1, 2, 3, and 4

Answer & Explanation

7. Refrigerators have become a common household appliance. A refrigeration system
a) removes heat from a low temperature body and delivers it to a high temperature body.
b) removes heat from a high temperature body and delivers it to a low temperature body
c) rejects energy to a low temperature body
d) none.

Answer & Explanation

8. With reference to petrol and diesel engine, consider the following statements:
1. A petrol engine draws a mixture of petrol and air while a diesel engine draws only air during suction.
2. Both petrol and diesel engine uses a carburettor.
Which of the statements given above is/are correct?
a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

Answer & Explanation

9. Carbon nanotubes, often called the strongest material have which of the following properties?
1. high electrical and thermal conductivity.
2. very high tensile strength.
3. higher lifetime.
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 1 and 3 only
d) 1, 2 and 3

Answer & Explanation

10. Which of the following is/are charged particle?
1. Ions
2. Free radicals
3. Neutrons
Select the correct answer using the codes given below.
a) 1 only
b) 1 and 2 only
c) 2 only
d) 1, 2 and 3

Answer & Explanation

 

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Please read these important articles about prelims preparation

1. How UPSC asks current affairs in GS Prelims

2. How to practice prelims MCQs for UPSC

3. Applying logic in UPSC General Studies Prelims

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