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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

1,867.

Light of energy 5.0 eV falls on a metal of work function 3.0 eV and electrons are emitted, determine the stopping potential. [electronic charge, e = 1.60 x 108ms-19]

A.

1.7V

B.

2.0V

C.

8.0V

D.

15.0V

Correct answer is B

V8hfwoe=5.0×1.60×10193.0×1.6×10191.6×1019=2.0V

1,868.

A process by which two light atoms join to form a new atom of higher atomic mass is

A.

natural radioactivity

B.

nuclear fission

C.

nuclear fusion

D.

chain reaction

Correct answer is C

No explanation has been provided for this answer.

1,869.

Beta particles are faster-moving

A.

protons

B.

electrons

C.

neutrons

D.

photons

Correct answer is B

No explanation has been provided for this answer.

1,870.

Which of the following statements is not a reason for using soft iron in making the core of a transformer? It

A.

retains its magnetism for a long time

B.

is easily magnitised

C.

reduces energy loss due to hysteresis

D.

is easily demagnetised

Correct answer is A

No explanation has been provided for this answer.