General Knowledge Question Answer: Physics GK Questions and Answers

General Knowledge Physics Questions, Physics Quiz for Competitive Exams, Important Physics MCQs for GK

Q. A person throws an object on a horizontal frictionless plane surface. It is noticed that there are two forces acting on this object-(i) gravitational pull and (ii) normal reaction of the surface. According to the third law of motion, the net resultant force is zero. Which one of the following can be said for the motion of the object ?
1) The object will move with acceleration
2) The object will move with deceleration
3) The object will move with constant speed, but varying direction
4) The object will move with constant velocity

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Q. An electron and a proton starting from rest are accelerated through a potential difference of 1000 V. Which one of the following statements in this regard is correct?
1) The kinetic energy of both the particles will be different
2) The speed of the electron will be higher than that of the proton
3) The speed of the proton will be higher than that of the electron
4) The speed of the electron and the proton will be equal

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Q. Two wires are made having same length/ and area of cross-section A. Wire 1 is made of copper and wire 2 is made of aluminium. It is given that the electrical conductivity of copper is more than that of aluminium. In this context, which one of the following statements is correct?
1) The resistance of wire 1 will be higher than that of wire 2
2) The resistance of wire 2 will be higher than that of wire 1
3) The resistance of both the wires will be the same
4) If same current is flown through both the wires, the power dissipated in both the wires will be the same

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Q. Which one of the following elements is used as a timekeeper in atomic clocks ?
1) Potassium
2) Caesium
3) Calcium
4) Magnesium

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Q. Why is argon gas used along with tungsten wire in an electric bulb ?
1) To increase the life of the bulb
2) To reduce the consumption of electricity
3) To make the emitted light colored
4) To reduce the cost of the bulb

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Q. Sound waves cannot travel through a -
1) copper wire placed in air
2) silver slab placed in air
3) glass prism placed in water
4) wooden hollow pipe placed in vacuum

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Q. Working of Safely fuses depends upon :
1. magnetic effect of the current.
2. chemical effect of the current.
3. magnitude of the current.
4. heating effect of the current.
Select the correct answer using the code given below.

1) 1, 2, 3 and 4
2) 1, 2 and 3 only
3) 3 and 4 only
4) 4 only

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Q. Which of the following represents a relation for heat lost = heat gained?
1) Principle of thermal equilibrium
2) Principle of colors
3) Principle of calorimetry
4) Principle of vaporization

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Q. When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is -
1) reflection of light
2) refraction of light
3) dispersion of light
4) scattering of light

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Q. A refracting telescope consists of :
1) One concave mirror and one convex lens
2) Two convex lenses of unequal focal lengths
3) Two concave mirrors of different focal length
4) Two convex lenses of equal focal length

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