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
- Electric charge 1.Watt
- Electric resistance 2.Voli
- Power 3.Ohm
- 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
- Angle 1. m3
- Volume 2. m2
- Frequency 3. Radian
- 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
Angle radian
Volume m3
Frequency Hertz
Area m2
6. Match the following lists:
List-I List-II
- Diesel 1. Redolf Diesel
- Fountain pen 2. Levis Waterman
- Steam engine 3. James Watt
- 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
- Television 1.Mackmilan
- Microphone 2.Thomsa Alva Addition
- Gramophone 3.J.L.Beard
- 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
Gramophone – Thomas Alva Addition
Bicycle – Mackmilan.
8. Match the following lists:
List-I List-II
- Kinetic energy 1. Q/T
- Potential energy 2. 1/2 mv2
- Distance 3. Time x Speed
- 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
- Maanometer 1. Depth of sea
- Fathometer 2. Gas pressure
- Cryometer 3. Density of gas
- 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.