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JAMB Physics Past Questions & Answers - Page 53

261.

A force of 6N acts horizontally on a stationary mass of 2kg for 4s. The kinetic energy gained by the mass is _________

366j

240j

144j

90j

View answer & explanation

Correct answer is C

F = 6N, m = 2kg, t = 4s, u = 0 (stationary or at rest)

K.E

$^2$

from rest

K.E

)

$^2$

2 x (

$\frac{6 \times 4}{2})^2 = 12^2 = 144J$

262.

The following are parts of the eye
I. Retina
II. Pupil
III. Iris
The correct equivalent in the camera in the same order are

Diaphragm, Aperture, film

Aperture, Diaphragm, Film

Film, Diaphragm, Aperture

Film, Aperture, Diaphragm

View answer & explanation

Correct answer is D

- retina is similar to film
- pupil is similar to aperture
- iris is similar to diaphragm

263.

The earth's gravitational field intensity at its surface is about
(G = 6.7 × 10 $^{-11}$ Nm $^2$ /kg $^2$ , mass of the earth is 6 × 10 $^{24}$ kg, radius of the earth is 6.4 × 10 $^6$ m, g on the earth = 9.8m/s $^2$ )

6.7N/kg

7.9N/kg

8.0N/kg

9.8N/kg

View answer & explanation

Correct answer is D

GMm/d

$^2$

6.7 × 10

$^{-11}$ × 6 × 10

$^{24}$

(6.4 × 10

$^6$ )

$^2$

9.8N

E = g = 9.8N/kg

264.

Which of the following media allow the transmission of sound waves through them?
I. air
II. liquid
III. solids

I & II only

I & III only

II & III only

I, II & III

View answer & explanation

Correct answer is D

- sound travels through solids, liquids & gases
- sound travels faster in solid than in liquid & faster in liquid than in gases.

265.

The conductivity of gases at low pressure can be termed as
I. hot cathode emission
II. thermo ionic emission
III. cold cathode emission
IV. Field emission

I & II

II & III

III & IV

IV & V

View answer & explanation

Correct answer is C

As conduction of gases is at low pressure and high voltage, called field or cold cathode emission.

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