1.
What would be the electric flux due to two charges one at the origin of the Gaussian sphere and another at a distance of 4b from origin. Let the radius of the Gaussian sphere be 3b and the charge be Q.
A. 
B. 
C. 
D. 
2.
What happens to mutual inductance of pair of coils when distance between the coils is increased:
A. 
Mutual Inductance of first coil will increase with decrease in second coil
B. 
Mutual Inductance of both the coils increases
C. 
Mutual Inductance of both the coils decreases
D. 
Mutual Inductance of second coil will increase with decrease in first coil
3.
For a semiconductor a negative resistance could found during a:
A. 
B. 
C. 
D. 
4.
What would be the current through the resistance which is connected to three voltage source connected in parallel to each other:
A. 
B. 
C. 
D. 
5.
What is the reason for the damping of copper plate when it is allowed to oscillate in between the two magnetic poles:
A. 
B. 
C. 
D. 
6.
What is the S.I. Unit of Radioactivity:
A. 
B. 
C. 
D. 
7.
Welders wear special goggles to protect their eyes from:
A. 
B. 
C. 
D. 
8.
De Broglie waves associated with a football is not visible because:
A. 
B. 
C. 
D. 
9.
When does a transistor act as a switch:
A. 
Collector current is kept constant
B. 
Collector current is increases
C. 
Collector current is zero
D. 
Collector current decreases
10.
What is used to converge the light beam at a single point on the screen during diffraction:
A. 
B. 
C. 
D. 
11.
When a dielectric medium is introduced in between a capacitor, the capacitance:
A. 
B. 
C. 
D. 
12.
If the capacitor is being charged by an external ac source with an instantaneous current of I0 cos ωt. The displacement current would be:
A. 
B. 
C. 
D. 
13.
In which phenomenon the electrons move with an average velocity which is independent of time, although the electrons are accelerated:
A. 
B. 
C. 
D. 
14.
For drift velocity the electrons move from:
A. 
Low potential to high potential
B. 
High potential to low potential
C. 
Negative potential to zero potential
D. 
Positive potential to zero potential
15.
A potentiometer is not affected by the internal resistance of the source because:
A. 
The internal resistance of a given cell is fixed
B. 
One of the cells is chosen as a standard cell whose emf is known to a high degree of accuracy
C. 
To maintain a steady current
D. 
It draws no current from the voltage source being measured
16.
The air bubble inside water acts as a _____ lens
A. 
B. 
C. 
D. 
17.
A+B = Y denotes which Gate:
A. 
B. 
C. 
D. 
18.
The condition for maximum power dissipation is:
A. 
B. 
C. 
D. 
19.
What would be the resistance of the light bulb rated at 100 W for 220 V ac supply:
A. 
B. 
C. 
D. 
20.
What will happen if an open circuit is used in place of the closed loop?
A. 
Flux is induced at the centre of the circuit
B. 
Flux is induced at only one of the ends of the circuit
C. 
Flux is induced across the open ends of the circuit
D. 
Flux is induced for a short period of time
21.
If £ is the emf induced between axle and the rim of a wheel. What is the effect on emf if number of spokes were increased?
A. 
B. 
C. 
D. 
22.
Device used only to check the flow of current in a circuit:
A. 
B. 
C. 
D. 
23.
Current is flowing from east to west in a wire AB. What would be the direction of the flow of current in a wire CD parallel to AB:
A. 
B. 
C. 
D. 
24.
Name the semiconductor device which works under the reverse bias condition:
A. 
B. 
C. 
D. 
25.
In a diode, what happens at critical voltage:
A. 
B. 
C. 
D. 
Recombination of Charges Occur