3 : 5
4 : 5
7 : 10
13 : 10
Correct answer is B
Wt. in air = 0.25 N
Wt.in water = 0.15 N
therefore lost in wt. in water = Upthrust in water
= 0.25 - 0.15
= 0.10 N.
Wt. in paraffin oil = 0.17 N.
.. loss in wt.in oil = upthrust in the oil
Ratio upthrust in oil to upthrust in water
= 0.18/0.10 = 8/10 = 4/5 Or 4 : 5
The magnetic force on a charged particle moving with velocity v is
proportional to both the magnitude of the charge and the velocity v
independent of the magnitude of the charge
proportional to the velocity v only
proportional to the magnitude of the charge only
Correct answer is A
The magnetic force on a charge is given by
F = qVB Sinθ,
thus the force is proportional to both the magnitude by the charge (q) and the velocity (V)
(i/e F α qV)
I/16 H
I/8 H
I/64 H
I/32 H
Correct answer is D
Resonant, frequency in an a.c. circuit is given by F = I/2π√LC
therefore 200 * 103 = I/2 * π√l * 20 * 10-12
therefore (2.0 * 105)2 = I/4 * π2 * L * 20 * 10-12
THEREFORE L = I/4.0 * 1010 * 4 * 10 * 20 * 10-12
(if π2 = 10)
= I/16 * 1011 * 2.0 * 10-11
Therefore L = I/32 H
Energy losses through eddy currents are reduced by using
low resistance wires
insulated soft iron wires
few turns of wires
high resistance wires
Correct answer is B
No explanation has been provided for this answer.
A transistor function mainly as a
switch and amplifier
rectifier and an amplifier
charge storer and an amplifier
charge storer and a switch
Correct answer is A
No explanation has been provided for this answer.