A beam of light contains two wavelengths 6500Å and 5200Å. They form interference fringes in Young’s double slit experiment. What is the least distance (approx) from central maximum, where the bright fringes due to both […]
An ideal gas is expanding such that PT²=constant. The coefficient of volume expansion of the gas is
Options
(a) 1/T (b) 2/T (c) 3/T (d) 4/T
Correct Answer:
3/T
Explanation:
No explanation available. […]
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
Options
(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
Options
(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
Options
(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
Options
(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
Options
(a) √2 T (b) […]
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