The workdone in turning a magnet of magnetic moment M by an angle of 90⁰ from the magnetic meridian is n times the corresponding work done to turn it through an angle of 60⁰. The […]
The phenomenon of radioactivity
Options
(a) increases on applied pressure (b) is exothermic change which increases or decreases with temperature (c) is nuclear process which does not depend on external forces (d) None […]
Which one of the following options shows correct matching pair?
Options
(a) man – ureotelic (b) bird – ammonotelic (c) fish – uricotelic (d) frog – uricotelic
Correct Answer:
man – ureotelic
Explanation: […]
A sphere of 4cm radius is suspended with in a hollow sphere of 6cm radius. If the inner sphere is charged to a potential 3esu while the outer sphere is earthed, then the charge on […]
The depletion layer in the p-n junction region is caused by
Options
(a) drift of holes (b) drift of electrons (c) diffusion of carriers (d) migration of impurity ions
Correct Answer:
diffusion of carriers
What is the value of Ā+A in the Boolean algebra?
Options
(a) A (b) 0 (c) 1 (d) Ā
Correct Answer:
1
Explanation:
Ā + A should always be equal to 1. As addition […]
The magnetic flux linked with a circuit of resistance 100Ω increases from 10 to 60 Wb. The amount of induced charge that flows in the circuit is (in coulomb)
Options
(a) 0.5 (b) 5 […]
Two coils have the mutual inductance of 0.05 H. The current changes in the first coil as I=I₀ sin ωt, where I₀=1 A and ω=100π rad/s. The maximum emf induced in secondary coil is
In photoelectric effect, the photoelectric current
Options
(a) depends both on intensity and frequency of incident beam (b) does not depend on frequency but depends only on intensity of incident beam (c) increases […]
An atom bomb weighing 1 kg explodes releasing 9×10¹³ J of energy. What percentage of mass is converted into energy?
Options
(a) 0 .1% (b) 1% (c) 2% (d) 10%
Correct Answer:
0 […]
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