- AElectric flux
- BMagnetic flux
- CMagnetic field
- DElectric field
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The de-Broglie wavelength of an electron having 80eV of energy is nearly (1eV = 1.6 × 10–19 J, Mass of electron = 9 × 10–31kg Plank’s constant = 6.6 × 10–34 J-sec)
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(a) 140 Å |
(b) 0.14 Å |
(c) 14 Å |
(d) 1.4 Å |
A prism having an apex angle 4o and refraction index 1.5 is located in front of a vertical plane mirror as shown in figure. Through what total angle is the ray deviated after reflection from the mirror

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(a) 176o |
(b) 4o |
(c) 178o |
(d) 2o |
A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is
|
(a) 200 J |
(b) 400 J |
(c) 25 J |
(d) 50 J |


During the nuclear fusion reaction
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(a) A heavy nucleus breaks into two fragments by itself |
|
(b) A light nucleus bombarded by thermal neutrons breaks up |
|
(c) A heavy nucleus bombarded by thermal neutrons breaks up |
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(d) Two light nuclei combine to give a heavier nucleus and possibly other products |
When the speed of a dc motor increases the armature current
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(a) Increases |
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(b) Decreases |
|
(c) Does not change |
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(d) Increases and decreases continuously |