In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. If the thickness of the sheet is half of the separation between the plates. The capacitance will be
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(a) |
(b) |
(c) 4C |
(d) 2C |
(d) 2C
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A radioactive nucleus undergoes a series of decay according to the scheme A 
If the mass number and atomic number of A are 180 and 72 respectively, then what are these number for A4
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(a) 172 and 69 |
(b) 174 and 70 |
(c) 176 and 69 |
(d) 176 and 70 |
How much kinetic energy will be gained by an α - particle in going from a point at 70 V to another point at 50 V
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(a) 40 eV |
(b) 40 keV |
(c) 40 MeV |
(d) 0 eV |
Assertion : A transistor is a voltage-operating device.
Reason : Base current is greater than the collector current.
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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 wavelength of sodium light in air is 5890 Å. The velocity of light in air is 3 
The wavelength of light in a glass of refractive index 1.6 would be close to
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(a) 5890 Å |
(b) 3681 Å |
(c) 9424 Å |
(d) 15078 Å |
What will happen when a 40 watt, 220 volt lamp and 100 watt, 220 volt lamp are connected in series across 40 volt supply
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(a) 100 watt lamp will fuse |
(b) 40 watt lamp will fuse |
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(c) Both lamps will fuse |
(d) Neither lamp will fuse |
The rest mass of the photon is
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(a) 0 |
(b) ∞ |
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(c) Between 0 and ∞ |
(d) Equal to that of an electron |
In the nuclear reaction 
, the values of A and Z are
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(a) A = 234, Z = 94 |
(b) A = 234, Z = 90 |
(c) A = 238, Z = 94 |
(d) A = 238, Z = 90 |
For the given combination of gates, if the logic states of inputs A, B, C are as follows A = B = C = 0 and A = B = 1, C = 0 then the logic states of output D are
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(a) 0, 0 |
(b) 0, 1 |
(c) 1, 0 |
(d) 1, 1 |
