WAEC Physics Past Questions & Answers - Page 259

1,291.

A body of mass 2kg is suspended from the ceiling of a lift with a light inextensible string. lf the lift moves upwards with acceleration of 2ms^-2, calculate the magnitude of the tension in the string (g = 1Oms^-2)

A.

24N

B.

20N

C.

16N

D.

4N

E.

0N

View answer & explanation

Correct answer is C

T + ma = mg
T = mg - ma = 2 x 10 - 2 x 2 = 16N

1,292.

A body of mass 4.2kg moving with velocity 10ms^-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V

A.

3ms^-1

B.

6ms^-1

C.

7ms^-1

D.

15ms^-1

E.

17ms^-1

View answer & explanation

Correct answer is B

M₁U = (M₁ + M₂)V = 4.2 x 10 = (4.2 = 2.8)V

∴ V =

4.2 x 10/7.0

= 6m/s

1,293.

The magnitude of the force required to make an object of mass M move with speed V in a circular path of radius R is given by the expression.

A.

mr/v

B.

(mr) ²/v

C.

mv²/r

D.

mv/2

E.

mv/r

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,294.

Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

A.

1 : 50

B.

3 : 20

C.

3:4

D.

4:3

E.

20:3

View answer & explanation

Correct answer is C

Efficiency =

M.A/V.R

x 100%

=

80/100

=

120 x 10/E

E = 250N

1,295.

The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms^-2)

A.

25N

B.

90N

C.

96N

D.

250N

E.

960N

View answer & explanation

Correct answer is D

Efficiency =

M.A/V.R

x 100%

=

80/100

=

120 x 10/E

E = 250N

WAEC Subjects

English Language

Agricultural Science

Physical Education

Further Mathematics

Literature in English

Islamic Religious Knowledge

Christian Religious Knowledge

Office Practice

Civic Education

Aptitude Tests

Situational Judgement Questions and Answers

Typing Speed and Accuracy Test

Spatial Reasoning Questions and Answers

Numerical Reasoning Questions and Answers

Quantitative Reasoning Questions and Answers

Personality Test

Nigeria General Knowledge Questions and Answers

Microsoft Office Questions and Answers

Verbal Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Data Interpretation Questions and Answers

Puzzles Questions and Answers

Logical Reasoning Questions and Answers

View latest jobs in Nigeria today