UPSC NCERT GENERAL SCIENCE NOTES: TOPIC WISE SOLVED MCQ’s

UPSC General Science : General Physics-1

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Today’s Topic :General Physics-1

1. Which one of the following is capillarity not the reason:

a) Rising of water from the roots of a plant to its foliage.

b) Blotting of ink.

c) Spread of water drop on a cotton cloth.

d) Rising of underground water.

Ans:     D

Explanation:    Capillary is hari like tube. It is found that when a capillary tube open at both end is dipped in a liquid, the liquid rises up in the tube. The example of capillarity are blotting of ink, spread of water drop on cotton cloth and rising of water from the root of plants to its foliage.

2. Which one of the following are the correct sequences of the given substances in the decreasing order of their densities?

a) Steel>Gold> Mercury                  b) Gold>Steel>Mercury

c) Gold> Mercury> steel                  d) None of these.

Ans:     C

Explanation:    The density of Gold = 19.3 gm/cm3, Mercury=13.6 gm/cm3 and Steel=7.6 gm/cm3, So the option (c) is correct. Density is calculated by Mass/Volume.

3. A weightless rubber balloon filled with 200cc of water. Its weight in water is equal to:

a) 9.8/5N                  b) 9.8/4N                  c) 9.8/10N                   d) None of these.

Ans:     D

Explanation:    Since the balloon is filled up with water and put into water, it is in a stable position. The downward force exerted by its equal to the upward buoyant force exerted by water. Hence its weight in water is zero as the resultant force on its is zero.

4. Match the following lists:

List-I                                        List-II

1. Electric charge                          1.Watt
2. Electric resistance                     2.Voli
3. Power                                        3.Ohm
4. Potential differences                  4.Coulomb

Codes:

A         B          C          D

a) 1         2          3          4

b) 3          4          2          1

c) 4          3          1          2

d) 3         2          4          1

Ans:     C

Explanation:

SI Unit                        Quantity

Coulombs        Electric charge

Volt                 Potential differences

Watt                 Power

Ohm                Resistance

5. Match the following lists:

List-I                            List-II

1. Angle                          1. m3
2. Volume                       2. m2
4. Area                           4. Hertz

Codes:

A         B          C          D

a) 1         2          3          4

b) 3         1          4          2

c) 4          2          1          3

d) 3          4          2          1

Ans:     B

Explanation:

Quantity                      SI Unit

Volume                                    m3

Frequency                    Hertz

Area                             m2

6. Match the following lists:

List-I                                  List-II

1. Diesel                             1. Redolf Diesel
2. Fountain pen                  2. Levis Waterman
3. Steam engine                 3. James Watt
4. Telephone                       4. Grahm Bell

Codes:

A         B          C          D

a) 2         3          4          1

b) 1          2          4          3

c) 1           2          3          4

d) 3           2          4          1

Ans:     C

Explanation:    In the above option is already correctly match as like A-1, B-2, C-3, D-4.

7. Match the following lists:

List-I                                List-II

1. Television                        1.Mackmilan
3. Gramophone                   3.J.L.Beard
4. Bicycle                            4.Grahm Bell

Codes:

A          B          C          D

a) 3          1          4          2

b) 3          4          2          1

c) 1           2          3          4

d) 3           2          1          4

Ans:     B

Explanation:

Television       –           J.L.Beard

Microphone     –           Grahm Bell

Bicycle            –           Mackmilan.

8. Match the following lists:

List-I                            List-II

1. Kinetic energy              1. Q/T
2. Potential energy           2. 1/2 mv2
3. Distance                       3. Time x Speed
4. Current                         4. Mgh

Codes:

A         B          C          D

a) 1        2          3          4

b) 2        4           3          1

c) 1         3          2          4

d) 2         3          1          4

Ans      B

Explanation:    Kinetic energy = 1/2mv2

(m = Mass, v = Velocity)

Potential energy = Mgh

(h = height,      g = acceleration due to gravity)

Distance = Time x Speed

Current = Q / T = Charge / Time.

9. Match the following lists:

List-I                            List-II

1. Maanometer                  1. Depth of sea
2. Fathometer                    2. Gas pressure
3. Cryometer                      3. Density of gas
4. Dasymeter                     4. Low temperature

Codes:

A         B          C          D

a) 2         1          4          3

b) 2         4          3          1

c) 3         1          4          2

d) 3         1          2          4

Ans:     A

Explanation:

Manometer     –           Gas pressure

Fathometer       –           Depth of sea

Cryometer        –           Low temperature

Dasymeter       –           Density of gas

10. Graphene, a newly discovered allotrope of carbon can have application in:

1) Solar cells

2) Sensors to diagnose diseases

3) Lithium ion batteries

4) High frequency

5) Display screens

Which of the following statements is/are correct:

a) 1, 2 and 3                  b) 2, 3 and 4                  c) Only 5                     d) All of these

Ans:     D

Explanation:    Due to a large surface area, graphene is used to prepare sensors and display screens. High-frequency transistors can also be prepared with the help of graphene because of the higher speed at which electrons in graphene move as compare to electrons in silicon. Carbon solar cell uses graphene as electrodes in lithium-ion batteries graphene is used as an anode.