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A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at
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(a) 30 cm left |
(b) Infinity |
(c) 1 cm to the right |
(d) 18 cm to the left |
Five resistors of given values are connected together as shown in the figure. The current in the arm BD will be
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(a) Half the current in the arm ABC |
(b) Zero |
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(c) Twice the current in the arm ABC |
(d) Four times the current in the arm ABC |
To increase the angular magnification of a simple microscope, one should increase:
To compare magnetic moments of two magnets by vibration magnetometer, 'sum and difference method' is better because
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(a) Determination of moment of inertia is not needed which minimises the errors |
| (b) Less observations are required |
| (c) Comparatively less calculations |
| (d) All the above |
99% of a radioactive element will decay between
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(a) 6 and 7 half lives |
(b) 7 and 8 half lives |
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(c) 8 and 9 half lives |
(d) 9 half lives |
Assertion : In photoemissive cell inert gas is used.
Reason : Inert gas in the photoemissive cell gives greater current.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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. |
