1

The molecular structure of a liquid is such that

A

the molecules have unlimited freedom of movement

B

molecular movement is restricted to vibration only

C

intermolecular collisions take place

D

all molecules moves move with the same speed

CORRECT OPTION:
c

2

Which of the following statements about the mass and the weight of a body is not correct? its

A

mass is a scalar quantity

B

weight is a function of the gravitational pull on it

C

mass on earth and on the moon is the same

D

weigh at the equatior and at the poles is the same

CORRECT OPTION:
d

3

An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X

A

3.300

B

1.279

C

0.932

D

0.782

CORRECT OPTION:
d

R.d = Wt in Air-Wt in Air-Wt in water

= \(\frac{60.0 - 48.2}{60.0 - 44.9}\)

= 0.782

= \(\frac{60.0 - 48.2}{60.0 - 44.9}\)

= 0.782

4

Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm^{-3}, density of ice = 0.9cm^{-3}]

A

0.00cm^{3}

B

9.00cm^{3}

C

10.00cm^{3}

D

90.00cm^{3}

CORRECT OPTION:
c

\(\Delta\)y = V_{ice} - V_{water}

= \(\frac{90}{0.9} - \frac{90}{1} = 10cm^3\)

= \(\frac{90}{0.9} - \frac{90}{1} = 10cm^3\)

5

The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave

A

20 Hz

B

10 Hz

C

5 Hz

D

4 Hz

CORRECT OPTION:
b

6

Which of the following concept is not an evidence of the particle nature of matter?

A

diffusion

B

brownian motion

C

diffraction

D

crystallization

CORRECT OPTION:
d

7

A diver is 5.2m below the surface of water of density 1000Kgm^{-3}. If the atmospheric pressure is 1.02 x 10^{5}pa. Calculate the pressure on the diver [g = 10ms^{-2}]

A

6.20 x 10^{4} pa

B

1.02 x 10^{5} pa

C

1.54 x 10^{5} pa

D

5.20 x 10^{5} pa

CORRECT OPTION:
c

P = hpg + A.P

= 5.2 x 1000 x 10 + 1.02 x 10^{5}

= 1.54 x 10^{5}

= 5.2 x 1000 x 10 + 1.02 x 10

= 1.54 x 10

8

A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine

A

increased the surface tension of the water

B

reduces the density of the water

C

reduces the surface tension of the water

D

reduces the upthrust on the needle

CORRECT OPTION:
c

9

On which of the following factor does the viscosity of a liquid depend? i. Nature of the liquid. ii. Temperature of the liquid. iii. Area of the liquid surface

A

i and ii only

B

ii and iii only

C

i and iii only

D

i, ii and iii

CORRECT OPTION:
d

10

An elastic string of force constant 200N m^{-1} is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string

A

64.0J

B

80.0J

C

128.0J

D

160.0J

CORRECT OPTION:
a

E = \(\frac{1}{2}Ke^2\)

= \(\frac{1}{2} \times 200(0.8)^2 = 64J\)

= \(\frac{1}{2} \times 200(0.8)^2 = 64J\)

Pages: