Two resistors whose value are in ratio 2 : 1 are connected in parallel with one cell. Then ratio of power dissipated is
|
(a) 2 : 1 |
(b) 4 : 1 |
(c) 1 : 2 |
(d) 1 : 1 |
(c) 1 : 2
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Assertion : The stars twinkle while the planets do not.
Reason : The stars are much bigger in size than the planets.
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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. |
X-rays are produced in X-ray tube operating at a given accelerating voltage. The wavelength of the continuous X-rays has values from
| (a) 0 to ∞ |
(b)  to ∞, where 
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(c) 0 to  where
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(d) to , where 0 < 
|
The capacity of a spherical conductor in MKS system is
|
(a) |
(b) |
(c) |
(d) |
Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude
|
(a) Temperature of Q is higher than that of P |
|
(b) Temperature of Q is lower than that of P |
|
(c) Star Q is at the same distance at that of star P |
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(d) Star P is farther than star Q |
Focal length of a plane mirror is
|
(a) Zero |
(b) Infinite |
(c) Very less |
(d) Indefinite |
The wing span of an aeroplane is 20 metre. It is flying in a field, where the vertical component of magnetic field of earth is 5 × 10–5 tesla, with velocity 360 km/h. The potential difference produced between the blades will be
|
(a) 0.10 V |
(b) 0.15 V |
(c) 0.20 V |
(d) 0.30 V |
