2021 Prelims Paper 1 UPSC Question Paper

2021 Prelims Paper 1 UPSC Questions

1.
Water can dissolve more substances than any other liquid because
A.
It is dipolar in nature
B.
It is a good conductor of heat
C.
It has high value of specific heat
D.
It is an oxide of hydrogen
ANSWER :
A. It is dipolar in nature
2.

With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
2. As street-lights, sodium lamps have longer life span than LED lamps.
3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street-lighting.
Select the correct answer using the code given below.

A.

3 only

B.

2 only

C.

1 and 3 only

D.

1, 2 and 3

ANSWER :

C. 1 and 3 only

3.
The term โ€˜ACE2โ€™ is talked about in the context of
A.
genes introduced in the genetically modified plants
B.
development of Indiaโ€™s own satellite navigation system
C.
radio collars for wildlife tracking
D.
spread of viral diseases
ANSWER :
D. spread of viral diseases
4.
Bisphenol A (BPA), a cause of concern, is a structural/key component in the manufacture of which of the following kinds of plastics?
A.
Low-density polyethylene
B.
Polycarbonate
C.
Polyethylene terephthalate
D.
Polyvinyl chloride
ANSWER :
B. Polycarbonate
5.
โ€˜Triclosanโ€™, considered harmful when exposed to high levels for a long time, is most likely present in which of the following?
A.
Food preservatives
B.
Fruit-ripening substances
C.
Reused plastic containers
D.
Toiletries
ANSWER :
D. Toiletries
6.
Which one of the following is a reason why astronomical distances are measured in light-years?
A.
Distances among stellar bodies do not change.
B.
Gravity of stellar bodies does not change.
C.
Light always travels in straight line.
D.
Speed of light is always same.
ANSWER :
D. Speed of light is always same.
7.

We adopted parliamentary democracy based on the British model, but how does our model differ from that model?
1. As regards legislation, the British Parliament is supreme or sovereign but in India, the power of the Parliament to legislate is limited.
2. In India, matters related to the constitutionality of the Amendment of an Act of the Parliament are referred to the Constitution Bench by the Supreme Court.
Select the correct answer using the code given below.

A.

1 only

B.

2 only

C.

Both 1 and 2

D.

Neither 1 nor 2

ANSWER :

A. 1 only

8.

With reference to the Union Government, consider the following statements:
1. N. Gopalaswamy Iyengar Committee suggested that a minister and a secretary be designated solely for pursuing the subject of administrative reform and promoting it.
2. In 1970, the Department of Personnel was constituted on the recommendation of the Administrative Reforms Commission, 1966, and this was placed under the Prime Minister’s charge.
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 :

B. 2 only

9.
โ€˜Right to Privacyโ€™ is protected under which Article of the Constitution of India?
A.
Article 15
B.
Article 19
C.
Article 21
D.
Article 29
ANSWER :
C. Article 21
10.

Consider the following statements:
1. In India, there is no law restricting the candidates from contesting in one Lok Sabha election from three constituencies.
2. In 1991 Lok Sabha Election, Shri Devi Lal contested from three Lok Sabha constituencies.
3. As per the existing rules, if a candidate contests in one Lok Sabha election from many constituencies, his/her party should bear the cost of bye-elections to the constituencies vacated by him/her in the event of him/her winning in all the constituencies.
Which of the statements given above is/are correct?

A.

1 only

B.

2 only

C.

1 and 3

D.

2 and 3

ANSWER :

B. 2 only