1

The dimensions of momentum are

A

MLT

B

ML^{-1}T^{-1}

C

MLT^{-1}

D

ML^{-1}T

CORRECT OPTION:
c

Momentum = kgms^{-1} = MLT^{-1}

2

A student measures the volume of a liquid using a measuring cylinder. What else needs to be measured by the student in order to determine the density of the liquid?

A

depth of the liquid in the cylinder

B

mass of the cylinder

C

mass of the liquid

D

tempersture of the liquid

CORRECT OPTION:
c

3

The diagram given, represents the graph of stress against strain for an elastic wire. The point Q on the graph is the

A

elastic linit

B

breaking point

C

yield point

D

proportional limit

CORRECT OPTION:
b

4

A ball is dropped from the top of a tower. Due to air resistance,it reaches terminal velocity. Which of the following statement(s) about its motion is/are correct? i. The acceleration of the ball is zero. ii. The net force on the ball is zero. iii. The velocity of the ball increases.

A

i only

B

i and ii only

C

ii and iii only

D

i, ii and iii

CORRECT OPTION:
a

5

Which of the following substances lowers the surface tension of water?

A

metal

B

sand

C

detergent

D

paper

CORRECT OPTION:
c

6

An object of volume 400cm^{3} and 2.5gcm^{-3} is suspended from a spring balance with half its volume immersed in water. Determine the reading on the spring balance. (Density of water = 1gcm^{-3})

A

1200g

B

1000g

C

800g

D

400g

CORRECT OPTION:
c

Mass = density x volume

400 x 2.5 = 1000g

Loss in mass = volume x density

= \(\frac{400}{2}\) x 1 = 200g

Reading on spring balance = 1000 - 200g = 800g

400 x 2.5 = 1000g

Loss in mass = volume x density

= \(\frac{400}{2}\) x 1 = 200g

Reading on spring balance = 1000 - 200g = 800g

7

The diagram given illustrates a force-distance graph for the motion of a wooden block. Determine the work done on the block when moved through a distance of 5m.

A

4J

B

15J

C

5J

D

100J

CORRECT OPTION:
d

W = FS = 20 X 5

= 100J

= 100J

8

The two person of a body undergoing a uniformly accelerated motion are (10s, 10ms^{-1}) and (30s, 50ms^{-1}). On the velocity-time graph pf the body.

A

0.5ms^{-2}

B

2.0ms^{-2}

C

10.0ms^{-2}

D

40.0ms^{-2}

CORRECT OPTION:
b

Slope = a = \(\frac{\deltav}{\deltat}\)

= \(\frac{50 - 10}{30 - 10}\)

= 2.0ms^{-2}

= \(\frac{50 - 10}{30 - 10}\)

= 2.0ms

9

At a birthday party, the celebrant pops a corked fruit wine. If the cork shoots out of the bottle at an angle of 40^{o} to the horizontal and travels a horizontal distance of 4.50m in 1.25s. Calculate the initial speed of the cork.

A

4.2ms^{-1}

B

4.7ms^{-1}

C

5.6ms^{-1}

D

7.1ms^{-1}

CORRECT OPTION:
b

R = Ucos\(\theta\) x t

U = \(\frac{R}{Cos \theta \times t}\)

= \(\frac{4.50}{Cos40N.25}\)

= 4.699m/s

U = \(\frac{R}{Cos \theta \times t}\)

= \(\frac{4.50}{Cos40N.25}\)

= 4.699m/s

10

A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.

A

60g

B

80g

C

120g

D

200g

CORRECT OPTION:
d

Clock-wise moment = Anti-clock wise

15 x m = 5 x 10

m = 200g

15 x m = 5 x 10

m = 200g

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