- ✓$M^0 L^0 T ^0 A^0$
- B$M ^0 L^{-1} T^{-1} A^{-2}$
- C$M ^0 L^1 T^0 A^0$
- D$M ^1 L^{-1}T^0 A^{-2}$
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Two waves having intensity in the ratio 25 : 4 produce interference. The ratio of the maximum to the minimum intensity is
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(a) 5 : 2 |
(b) 7 : 3 |
(c) 49 : 9 |
(d) 9 : 49 |
Assertion : The lightening conductor at the top of high building has sharp pointed ends.
Reason : The surface density of charge at sharp points is very high resulting in setting up of electric wind.
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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. |
In Young’s experiment, the ratio of maximum to minimum intensities of the fringe system is 4 : 1. The amplitudes of the coherent sources are in the ratio
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(a) 4 : 1 |
(b) 3 : 1 |
(c) 2 : 1 |
(d) 1 : 1 |
A 50V battery is connected across a 10 ohm resistor. The current is 4.5 amperes. The internal resistance of the battery is
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(a) Zero |
(b) 0.5 ohm |
(c) 1.1 ohm |
(d) 5.0 ohm |
Assertion : Electric lines of force cross each other.
Reason : Electric field at a point superimpose to give one resultant electric field.
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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 assertion is false but reason is true. |
The bending of light as it passes from one medium into another is commonly known as:
A light has amplitude A and angle between analyser and polariser is 60°. Light is reflected by analyser has amplitude
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(a) A |
(b) A/ |
(c) |
(d) A/2 |
Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)
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(a) |
(b) 1 + |
(c) |
(d) |