Explanation:
When the block kept at rest is hit by a bullet, the block acquires certain velocity by the conservation of linear momentum.
Therefore, the linear momentum and the kinetic energy of the block change.
As some of the kinetic energy carried by the bullet transforms into heat energy, its temperature also changes.
However, the gravitational potential energy of the block does not change, as the height of the block does not change in this process.
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If the refractive indices of crown glass for red, yellow and violet colours are 1.5140, 1.5170 and 1.5318 respectively and for flint glass these are 1.6434, 1.6499 and 1.6852 respectively, then the dispersive powers for crown and flint glass are respectively
|
(a) 0.034 and 0.064 |
(b) 0.064 and 0.034 |
(c) 1.00 and 0.064 |
(d) 0.034 and 1.0 |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
|
(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |
Two voltameters, one of copper and another of silver, are joined in parallel. When a total charge q flows through the voltameters, equal amount of metals are deposited. If the electrochemical equivalents of copper and silver are 
and 
respectively the charge which flows through the silver voltameter is
|
(a) |
(b) |
(c) |
(d) |
A plane glass slab is kept over various coloured letters, the letter which appears least raised is
|
(a) Blue |
(b) Violet |
(c) Green |
(d) Red |
Which of the following has the mass closest in value to that of the positron (1 a.m.u = 931 Mev)
|
(a) Proton |
(b) Electron |
(c) Photon |
(d) Neutrino |
When light travels from one medium to the other of which the refractive index is different, then which of the following will change
|
(a) Frequency, wavelength and velocity |
(b) Frequency and wavelength |
|
(c) Frequency and velocity |
(d) Wavelength and velocity |
