A monoatomic gas is suddenly compressed to (1/8)th of its initial volume adiabatically. The ratio of its final pressure to the initial pressure is (given the ratio of the specific heat of the given gas […]
If the focal length of a concave mirror is 50 cm, then where should the object is placed, so that its image is two times and inverted
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(a) 55 cm (b) (-75 […]
The magnifying power of a convex lens of focal length 10 cm, when the image is formed at the near point is
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(a) 6 (b) 5.5 (c) 4 (d) 3.5
Correct Answer: […]
A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta particles in the next 2 s. The mean life of the sample is
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(a) 4 s […]
A uranium nucleus ₉₂ U ²³⁸ emits an α-particle and a β-particle in succession. The atomic number and mass number of the final nucleus will be
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(a) 90233 (b) 90238 (c) 91238 […]
A wooden stick 2 m long is floating on the surface of water. The surface tension of water is 0.07 N/m. By putting soap solution on one side of the sticks, the surface tension is […]
A body cools in 7 minute from 60⁰C to 40⁰C. What time, in minute does it take to cool from 40⁰C to 28⁰C if the surrounding temperature is 10⁰C? Assume Newton’s law of cooling
The period of a simple pendulum inside a stationary lift is T. The lift accelerates upwards with an acceleration of g/3. The time period of pendulum will be
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(a) √2 T (b) […]
The escape velocity of a body on an imaginary planet which is thrice the radius of the earth are double the mass of the earth (Ve is the escape velocity from the earth)
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The moment of inertia of a uniform circular disc of radius R and mass M about an axis touching the disc at its diameter and normal to the disc
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(a) 1/2 MR² […]
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