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The activity of a sample is 64 × 10–5 Ci. Its half-life is 3 days. The activity will become 5 × 10–6 Ci after
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(a) 12 days |
(b) 7 days |
(c) 18 days |
(d) 21 days |
Which one of the following statements is correct
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(a) In vacuum, the speed of light depends upon frequency |
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(b) In vacuum, the speed of light does not depend upon frequency |
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(c) In vacuum, the speed of light is independent of frequency and wavelength |
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(d) In vacuum, the speed of light depends upon wavelength |
Three bulbs of 40 W, 60 W, 100 W are arranged in series with 220 volt supply which bulb has minimum resistance
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(a) 100 W |
(b) 40 W |
(c) 60 W |
(d) Equal in all bulbs |
An NPN-transistor circuit is arranged as shown in figure. It is
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(a) A common base amplifier circuit |
(b) A common emitter amplifier circuit |
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(c) A common collector amplifier circuit |
(d) Neither of the above |
The current in the given circuit is
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(a) 0.1 A |
(b) 0.2 A |
(c) 0.3 A |
(d) 0.4 A |
A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by
The capacitor of capacitance 4μF and 6 μF are connected in series. A potential difference of 500 volts applied to the outer plates of the two capacitor system. Then the charge on each capacitor is numerically (a) 6000 C (b) 1200 C (c) 1200 μC (d) 6000 μC 
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