-
Which of the following is not an example of perfectly inelastic collision?
(a) A bullet fired into a block if bullet gets embedded into block (B) Capture of electrons by an atom
© A man jumping on to a moving boat
(D) A ball bearing striking another ball bearing -
The length of second’s pendulum is 1 m on earth. If mass and diameter of the planet is doubled than that of earth, then length becomes
(a) 1 m
(B) 2 m
© 0.5 m
(D) 4 m -
A hot and a cold body are kept in vacuum separated from each other. Which of the following cause decrease in temperature of the hot body?
(a) Radiation
(B) Convection
© Conduction
(D) Temperature remains unchanged -
When a tuning fork produces sound waves in air, which one of the following is same in the material of tuning fork as well as in air?
(a) Wavelength
(B) Frequency
© Velocity
(D) Amplitude -
A bomb explodes on the moon. How long will it take for the sound to reach the earth?
(a) 10 s
(B) 1000 s
© 1 day
(D) None of these