Cathode rays are similar to visible light rays in that
|
(a) They both can be deflected by electric and magnetic fields |
|
(b) They both have a definite magnitude of wavelength |
|
(b) They both have a definite magnitude of wavelength |
|
(d) They both can expose a photographic plate |
(d) They both can expose a photographic plate
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A converging lens is used to form an image on a screen. When upper half of the lens is covered by an opaque screen
|
(a) Half the image will disappear |
|
(b) Complete image will be formed of same intensity |
|
(c) Half image will be formed of same intensity |
|
(d) Complete image will be formed of decreased intensity |
The distance between a proton and electron both having a charge 1.6 
of a hydrogen atom is 
. The value of intensity of electric field produced on electron due to proton will be
|
(a) 2.304 |
(b) 14.4 V/m |
(c) 16 V/m |
(d) 1.44 |
Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,
|
(a) Both draw the same current |
|
(b) A draws more current than B |
|
(c) B draws more current than A |
|
(d) Current drawn are in the ratio of their resistances |
Davission and Germer experiment proved
|
(a) Wave nature of light |
(b) Particle nature of light |
|
(c) Both (a) and (b) |
(d) Neither (a) nor (b) |
Thermocouple is a device for the measurement of
|
(a) Absolute temperature of a metal |
|
(b) The temperature difference between two substances |
|
(c) The couple acting on a wire |
|
(d) Thermal conductivity of a substance |
The pole strength of a bar magnet is 48 ampere-metre and the distance between its poles is 25 cm. The moment of the couple by which it can be placed at an angle of 30o with the uniform magnetic intensity of flux density 0.15 Newton /ampere-metre will be
|
(a) 12 Newton × metre |
(b) 18 Newton × metre |
|
(c) 0.9 Newton × metre |
(d) None of the above |
