NECO Physics Past Questions & Answers - Page 29

141.

Calculate the magnitude of the electric field intensity in vacuum at a distance of 25cm from a charge of 5 × 10^-3C. [Take 1/4πε₀]

A.

7.2 × 108NC^-1

B.

1.8 × 108NC^-1

C.

5.6 × 108NC^-1

D.

3.6 × 108NC^-1

E.

1.5 × 106NC^-1

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

142.

The time t₁, t₂ and t₃ for 20 complete oscillations of a simple pendulum experiment are 32.0s, 34.6s and 35.5s respectively. Calculate the mean period of the pendulum.

A.

1.60s

B.

1.70s

C.

1.73s

D.

1.78s

E.

5.11s

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

143.

Which of the following is NOT an example of a percussion instrument?

A.

Bell

B.

Drum

C.

Flute

D.

Gong

E.

Xylophone

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

144.

A mass of 5kg is suspended from the ceiling of a lift with a light inextensible string. As the lift moves upwards with an acceleration of 2ms^-2, the tension in the string is [g = 10ms^-2]

A.

25N

B.

40N

C.

50N

D.

60N

E.

70N

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

145.

A plane which is Inclined at an angle of 30 ° to the horizontal has a velocity ratio of

A.

2

B.

1

C.

0.87

D.

0.67

E.

0.5

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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