Physics Past Questions

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3201

A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?

A. 100
B. 150
C. 200
D. 250
E. 300

View Answer & Discuss (8) NECO 2001

3202

Which statement is TRUE of a block of stone of mass m, with zero momentum?

A. The acceleration of the stone is non-uniform
B. The stone is stationary
C. The stone moves at a constant velocity
D. The stone moves with maximum velocity
E. The stone moves with minimum velocity.

View Answer & Discuss (2) NECO 2001

3203

An electron of charge a = 1.6 × 10^-19C is situated in a uniform electric field of intensity 2.4 × 105 V m^-1. What is the force on the electron?

A. 1.60 × 10^-19N
B. 3.84 × 10¹⁹N
C. 1.92 × 10^-14N
D. 3.84 × 10^-14N
E. 7.68 × 10^-14N

View Answer & Discuss (3) NECO 2001

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3204

Which is NOT one of the laws of solid friction?

A. The frictional force between two surfaces opposes their relative motion
B. The ratio of frictional force to the normal reaction varies for two given surfaces
C. The ratio of frictional force to the normal reaction is constant for two given surfaces
D. The limiting frictional force is independent of the area of surface in contact.
E. Dynamic frictional force is independent of the relative velocity of the surfaces in contact.