Light wave enters from medium 1 to medium 2. Its velocity in 2nd medium is double from 1st. For total internal reflection the angle of incidence must be greater than
|
(a) 30o |
(b) 60 o |
(c) 45 o |
(d) 90 o |
(a) 30o
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In Young's double slit experiment using sodium light (λ = 5898 Å), 92 fringes are seen. If given colour (λ = 5461 Å) is used, how many fringes will be seen
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(a) 62 |
(b) 67 |
(c) 85 |
(d) 99 |
Assertion : The surface charge densities of two spherical conductors of different radii are equal. Then the electric field intensities near their surface are also equal.
Reason : Surface charge density is equal to charge per unit area.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed
|
(a) Vertically upward |
(b) Vertically downward |
|
(c) Towards the west |
(d) Towards the south |
As our eyes can not retrace the bent path of light, a stick, dipped in water, appears:
The combination of gates shown below produces
| (a) AND gate | (b) XOR gate | (c) NOR gate | (d) NAND gate |
Water of volume 2 litre in a container is heated with a coil of 1 kW at 27 oC. The lid of the container is open and energy dissipates at rate of 160 J/s. In how much time temperature will rise from 27oC to 77oC [Given specific heat of water is 4.2 kJ/kg]
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(a) 8 min 20 s |
(b) 6 min 2 s |
(c) 7 min |
(d) 14 min |