Avalanche breakdown is due to
Options
(a) Collision of minority charge carrier (b) Increase in depletion layer thickness (c) Decrease in depletion layer thickness (d) none of these
Correct Answer:
Collision of minority […]
A leaf which contains only green pigments is illuminated by a laser light of wavelength 0.6328 μm. It would appear to
Options
(a) black (b) green (c) brown (d) red
Correct Answer:
black
In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes from 2 A to 4 A. The value of coefficient of self induction of the coil is
A straight conductor of length 0.4 m is moved with a speed of 7 ms⁻¹perpendicular to a magnetic field of intensity 0.9 Wbm⁻². The induced emf across the conductor is
Options
(a) 5.04 […]
Which one of the following statements is WRONG in the context of X-rays generated from a X-ray tube?
Options
(a) Wavelength of characteristic X-rays decreases when the atomic number of the target increases […]
A photocell employs photoelectric effect to convert
Options
(a) Change in the frequency of light into a change in the electric current (b) Change in the frequency of light into a change in […]
Characteristic X-rays are produced due to
Options
(a) Transfer of momentum in collision of electrons with target atoms (b) Transition of electrons from higher to lower electronic orbits in an atom (c) Heating […]
A galvanometer having resistance of 50 Ω requires a current of 100μA to give full scale deflection. How much resistance is required to convert it into an ammeter of range of 10A?
Options
A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor. The current in the circuit is 0.5 A. The terminal voltage of the battery when the circuit is closed […]
If an electron and a positron annihilate, the energy released is
Options
(a) 3.2×10⁻¹³ J (b) 1.6×10⁻¹³ J (c) 4.8×10⁻¹³ J (d) 6.4×10⁻¹³ J
Correct Answer:
1.6×10⁻¹³ J
Explanation:
No explanation available. Be […]
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