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Venus appears brighter than other stars because
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(a) It is heavier than other planets |
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(b) Its density is more than other planets |
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(c) It is nearer to earth in comparison to other planets |
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(d) Nuclear fusion takes place at its surface |
A 3volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I, in the circuit will be
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(a) 1/3 A |
(b) 1 A |
(c) 1.5 A |
(d) 2 A |
The magnetic field due to a current carrying circular loop of radius 3 cm at a point on the axis at a distance of 4 cm from the centre is 54 mT. What will be its value at the centre of the loop
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(a) 250 m T |
(b) 150 m T |
(c) 125 m T |
(d) 75 m T |
Length of a hollow tube is 5m, it’s outer diameter is 10 cm and thickness of it’s wall is 5 mm. If resistivity of the material of the tube is 1.7 × 
W × m then resistance of tube will be
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(a) 5.6 × 10–5 W |
(b) 2 × 10–5 W |
(c) 4 × 10–5 W |
(d) None of these |
Assertion : If different gases are filled turn by turn at the same pressure in the discharge tube the discharge in them takes place at the same potential.
Reason : The discharge depends only on the pressure of discharge tube and not on the ionisation potential of gas.
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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. |
The magnetic flux linked with coil, in weber is given by the equation, 
The induced emf in the coil in the fourth second is
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(a) 10 V |
(b) 30 V |
(c) 45 V |
(d) 90 V |