Which of the following is an example of ideal black body?
Which of the following is an example of ideal black body?
Options
(a) Kajal (b) Black board (c) A pin hole in a box (d) None of these
Correct Answer:
A pin hole in […]
Which of the following is an example of ideal black body?
Options
(a) Kajal (b) Black board (c) A pin hole in a box (d) None of these
Correct Answer:
A pin hole in […]
A spring has time period T. It is cut into n equal parts. The time period of each part will be
Options
(a) T√n (b) T/√n (c) nT (d) T
Correct Answer:
T/√n
The magnetic susceptibility is negative for
Options
(a) Paramagnetic materials (b) Diamagnetic materials (c) Ferromagnetic materials (d) Paramagnetic and ferromagnetic materials
Correct Answer:
Diamagnetic materials
Explanation:
No explanation available. Be the first to […]
In radioactive element, β-rays are emitted from
Options
(a) Nucleus (b) Outer orbit (c) Inner orbit (d) None of these
Correct Answer:
Nucleus
Explanation:
β-rays are emitted from nucleus.
The kinetic energy needed to project a body of mass m from the surface of earth (radius R) to infinity is
Options
(a) mgR/2 (b) 2mgR (c) mgR (d) mgR/4
Correct Answer:
mgR
Length of a string tied to two rigid supports is 40 cm. Maximum length (wavelength in cm) of a stationary wave produced in it is
Options
(a) 20 cm (b) 80 cm (c) […]
In Young’s double slit experiment, the wavelength of the light used is doubled and distance between two slits is made half of initial distance. The resultant fringe width becomes
Options
(a) 2 times […]
Work done by an external agent in separating the parallel plate capacitor is
Options
(a) CV (b) 1/2 C²V (c) 1/2 CV² (d) None of these
Correct Answer:
1/2 CV²
Explanation:
Energy stored in […]
The energy band gap is maximum in
Options
(a) Metals (b) Superconductors (c) Insulators (d) Semiconductors
Correct Answer:
Insulators
Explanation:
No explanation available. Be the first to write the explanation for this question […]
In circular coil, when number of turns is doubled and resistance becomes 1/4th of initial value, the inductance becomes
Options
(a) 8 times (b) 2 times (c) 4 times (d) No change
Correct […]
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