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A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is

20 seconds

40 seconds

60 seconds

80 seconds

The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 30º with the resultant, find its magnitude.

100.0N

57.7N

43.3N

25.0N.

A train with an initial velocity of 20ms^{-1} is subjected to a uniform deceleration of 2m^{-2}. The time required to bring the train to a complete halt is

5s

10s

20s

40s.

Calculate the apparent weight loss of man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms^{-2}.

*[g = 10ms ^{-2}]*

686N

595N

581N

105N.

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?

*[density of the cork = 0.25 x 10 ^{3}kg^{-3}, density of the liquid = 1.25 x 10^{3}kgm^{-3}]*

0.8

0.5

0.2

0.1

An object is moving with a velocity of 5ms^{-1}. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

25.0m

20.0m

1.3m

1.0m

If a pump is capable of lifting 5000kg of water through a vertical height at 60m in 15min, the power of the pump is

2.5 x 10^{5}Js^{-1}

2.5 x10^{4}Js^{-1}

3.3 x 10^{3}Js^{-1}

3.3 x 10^{2}Js^{-1}

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere?

*[density of sea water = 1013kg ^{-3} one atmosphere = 0.01 x 10^{5}Nm^{-2} g= 10ms^{-2}]*

0.1m

1.0m

10.0m

100.0m.

What volume of alcohol will have same mass as 4.2m^{-3} of petrol?

*[density of alcohol = 8.4 x 10 ^{2}kgm^{-3} , density of petrol = 7.2 x 10^{3}kgm^{-3}]*

0.8m^{3}

1.4m^{3}

3.6m^{3}

49.m^{3}

Calculate the length which corresponds to a temperature of 20ºC if the ice and steam points of an ungraduated thermometer are 400mm apart.

20mm

30mm

60mm

80mm

A Wire of length 100.0m at 30°C has linear expansivity of 2 x 10^{-5}K^{-1}. Calculate Iength of the wire at a temperature of -10°C.

100.08m

100.04m

99.96m

99.92m.

A gas at a pressure of 10^{5}Nm^{-2} expands from 0.6m^{-3} to 1.2m^{3} at constant temperature, the work done is

7.0 x 10^{6}J

6.0 x 10^{6}J

6.0 x 10^{5}J

6.0 x 10^{4}J

What will happen to the boiling point of pure water When it is heated in a place 30m below sea level?

It will be more than 100°C

It will be less than 100°C

It will still be at 100°C

It will be fluctuating.

A wave that travels through stretched strings is known as

electromagnetic wave

micro wave

mechanical wave

seismic wave.

What is the velocity of sound at 100°C if the velocity of sound at 0°C is 340ms^{-1}?

497m^{-1}

440m^{-1}

397m^{-1}

240m^{-1}

A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at

0°

45°

90°

180°

From the diagram above, calculate the incident angle *i*.

41°

49°

55°

61°

What does the diagram above represent?

telescope in normal use

microscope in normal use

telescope in abnormal use

microscope in abnormal use.

The angle of deviation of light of various colours passing through a triangular prism increases in the order

red → green → blue

green → violet → blue

blue → red → green

blue → green → red.

Calculate the force acting on an electron of charge 1.5 x 10^{-19}C placed in an electric field of intensity 10^{5}Vm^{-1.}

1.5 x 10^{-11}N

1.5 x 10^{-12}N

1.5 x 10^{-13}N

1.5 x 10^{-14}N.

A cell of emf 1.5V is connected to series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell.

4.0Ω

3.0Ω

1.5Ω

1.0Ω

Induced emfs are best explained using

Ohm's law

Faraday's law

Colomb's law

Lenz's law.

The energy of a photon having a wavelength of 10^{-10}m is

*(h = 6.63 x 10 ^{-34}Js c = 3.0 x10^{8}ms^{-1}).*

2.0 x 10^{-15}J

1.7 x 10^{-13}J

2.0 x 10^{-12}J

1.7 x 10^{-12}J