- A$2.5\mu\text{s}$
- B$0.25\mu\text{s}$
- C$0.025\mu\text{s}$
- D$\text{None of these}$
Explanation:
Time period, $\text{T}=\frac{1}{\text{v}}$
$\text{T}=\frac{1}{40\times10^6}$
$\Rightarrow\text{T}=0.25\mu\text{s}$
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If 200 MeV energy is released in the fission of a single
nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given 1eV = 1.6 ![]()
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(a) 3.125 |
(b) 3.125 |
(c) 3.125 |
(d) 3.125 |
Resistance of one carbon filament and one tungsten lamp are measured individually when the lamp are lit and compared with their respective resistances when cold. Which one of the following statements will be true
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(a) Resistance of the carbon filament lamp will increase but that of the tungsten will diminish when hot |
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(b) Resistance of the tungsten filament lamp will increase but that of carbon will diminish when hot |
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(c) Resistances of both the lamps will increase when hot |
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(d) Resistances of both the lamps will decrease when hot |
In optical instruments, the lenses are used to form images by:
Assertion : 29 is the equivalent decimal number of binary number 11101.
Reason : (11101)2 = (1 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 1 × 20 )10 = (16 + 8 + 4 + 0 + 1)10 = (29)10
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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. |
Identify the paramagnetic substance
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(a) Iron |
(b) Aluminium |
(c) Nickel |
(d) Hydrogen |
If the temperature of cold junction of thermocouple is lowered, then the neutral temperature
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(a) Increases |
(b) Approaches inversion temperature |
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(c) Decreases |
(d) Remains the same |
Two short magnets of equal dipole moments M are fastened perpendicularly at their centre (figure). The magnitude of the magnetic field at a distance d from the centre on the bisector of the right angle is
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(a) |
(b) |
(c) |
(d) |