A potentiometer wire is 100cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are […]
An electric motor operating on a 60 volt D.C supply draws a current of 10 amp. If the efficiency of the motor is 50%, the resistance of its windings is
Options
(a) 3 ohm […]
A current of 2A flows through a 2Ω resistor when connected across a battery. The same battery supplies a current of 0.5A when connected across a 9Ω resistor. The internal resistance of the battery is […]
The nuclear radius of a certain nucleus is 7.2 fm and it has a charge of 1.28×10⁻¹⁷ C. The number of neutrons inside the nucleus is
Options
(a) 136 (b) 142 (c) 140 […]
The most stable particle in Baryon group is
Options
(a) Proton (b) Lamda-particle (c) Neutron (d) Omega-particle
Correct Answer:
Proton
Explanation:
The proton is the most stable in the Baryon group.
On bombarding U²³⁵ by slow neutron, 200 MeV energy is released. If the power output of atomic reactor is 1.6 MW, then the rate of fission will be
Options
(a) 8×10¹⁶/s (b) 20×10¹⁶/s (c) […]
The ratio of the nuclear radii of elements with mass numbers 216 and 125 is
Options
(a) (6:5) (b) √216:√125 (c) 218:05:00 (d) None of these
Correct Answer:
(6:5)
Explanation:
Nuclear radius of the […]
The ratio of minimum wavelengths of Lyman and Balmer series will be
Options
(a) 5 (b) 10 (c) 1.25 (d) 0.25
Correct Answer:
0.25
Explanation:
Minimum wavelength is for higher energy n = 1 […]
Which of the following transitions in hydrogen atoms emit photons of highest frequency?
Options
(a) n=1 to n=2 (b) n=2 to n=6 (c) n=6 to n=2 (d) n=2 to n=1
Correct Answer:
n=2 […]
Calculate power output of ₉₂²³⁵U reactor, if it takes 30 days to use up 2 kg of fuel, and if each fission gives 185 MeV of useable energy. Avagadro’s number=6×10²³/mol?
Options
(a) 56.3 […]
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