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 […]
AIEEE2002
A spring has time period T. It is cut into n equal parts. The time period of each part
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
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
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
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
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
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
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
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
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 […]