Physics : PRE Medical Entrance Question Bank
(Paper - 3)

1. Force acting on a charge moving in a magnetic field will not depend upon
A. its mass
B. amount of charge
C. its velocity
D. intensity of magnetic field

2. 200 W bulb works for 5 minutes, the energy consumed is
A. 70,000 J
B. 20,000 J
C. 63,000 J
D. 60,000 J

3. A 20 volt battery has a capacity of 106 joules. How long it can supply a current of 10A ?
A. 5 x 10⁵ sec
B. 5 x 10³ sec
C. 2 x 10⁵ sec
D. 2 x 10⁸ sec

4. The calories of heat developed in 200 watt heater in 7 minutes is estimated
A. 15000
B. 100
C. 1000
D. 20000

5. A ball is thrown vertically upwards in free space. Its total mechanical energy
A. remains constant throughout the motion
B. increases during ascent and decreases during descent
C. is zero at maximum height
D. is equal to kinetic energy at a point just below the maximum height

6. In the circuit shown, the current in the 20 ohms resistor, if the P.D. across XY is 50 volts is
A. 0.04 A
B. 10 A
C. 2.5 A
D. 1.8 A


 

7. If current through 3 ohms resistor is 1.2 amp, then potential drop through 4 ohms resistor is
A. 9.6 V
B. 2.6 V
C. 2.4 V
D. 1.2 V



8. The drift speed of electron in a conductor is of the order of
A. 10-³ m/s
B. 10² m/s
C. 10^-10 m/s
D. 10⁺⁸ m/s

9. What will happen to the capacity of a parallel plate capacitor in which a conductor plate is introduced?
A. Increase
B. Decrease
C. Remains same
D. None of these

10. If charge remains constant, what will happen to the surface potential of a wire whose diameter is doubled but length remains same?
A. Double
B. Half
C. One-third
D. Same

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