It' i's revision time, take Physics

49/49 MCQs for:

GCE O-Level 2018.

Which of the following is NOT a physical quantity?

The beauty of a works of arts.

The length of a woman’s gown.

The temperature of a patient.

The amplitude of a simple pendulum.

Which of the physical quantities below is a pair of a vector and a scalar quantity respectively?

Heat and temperature.

Velocity and speed.

Force and acceleration.

Kinetic energy and speed.

A body has a weight of 600 N on earth. If it is taken to the moon where the gravitational field strength is 1.7 N/kg. What will be the weight of the body?

6000N.

600N.

60N.

102 N.

In the figure, a shop keeper pulls a bag of rice of mass 50 kg along a rough horizontal floor, against a frictional force of 20N.

He applies a force of 100N on an inextensible string, inclined at an angle of 60° to the horizontal.

The acceleration of the bag is:

6 ms⁻².

0.3 ms⁻².

0.6 ms⁻².

2 ms⁻².

The figure shows a system of two masses in equilibrium, resting on a weightless beam of length 100 cm, pivoted at its center of gravity.

The distance x in cm is:

40.

60.

200.

25.

Which of the following is the S I. unit of linear momentum?

kgm/s².

Nm.

Nm/s.

kgm/s.

A ball of mass 0.20 kg hits a surface at a speed of 30 m/s and renounces with a speed of 20 m/s in the opposite direction. The change in momentum in S.I. units is:

10.

What is the significance of the slope of velocity against time?

The acceleration.

The kinetic energy.

The momentum.

The pressure.

Which of the pair of forces in the figure forms a couple?

A truck of mass 2500 kg moving at a speed of 7 ms-1 collides and sticks together with a stationary car of mass 1000 kg. The common velocity of the vehicles immediately after the collision is:

5 m s⁻¹.

17.5 m s⁻¹.

2 m s⁻¹.

7 m s⁻¹.

What are the two factors that determine the potential energy of a body?

Velocity and height.

Mass and speed.

Momentum and force.

Mass and height.

What energy transformation takes place when an electric fan is used in refreshing the air in the room?

Electrical energy to cold energy.

Kinetic energy to sound energy.

Potential energy to kinetic energy.

Electrical energy to mechanical energy.

The Greek god, Ego carries the Earth on his head for a year as a protection during an earthquake. When the great physicist came, he declared that he did no work on the Earth. The Physicist is right because:

The point of application of the force does not move at all.

The point of application of the force moves but not against any force.

He really got tied.

He does work against the atmospheric pressure.

A machine has a mechanical advantage of 4. This statement means that:

The Effort is four times the Load

The distance moved by the effort is four times the distance moved by the load.

The distance moved by the load is four times the distance moved by the effort.

The load is four times the effort.

A man of mass 100 kg carries a bag of cement of mass 50 kg up to the second floor, through a distance of 5 m. What is the total work done by the man against the force of gravity?

0 J.

2500 J.

5000 J.

7500 J.

The figure shows two uncharged identical metal spheres A and B in contact and a positively charged metal rod, R, placed close to A but not touching it.

Without any further action, the charges on A and B are respectively.

Negative and uncharged.

Positive and positive.

Negative and positive.

Positive and negative.

Which of the following graphs best illustrates the relationship between the force on a body accelerating constantly (y-axis) and the mass (x-axis)?

The S.I unit of charge is:

Coulomb.

Joule.

Watt.

Pascal.

The figure shows a network of three resistors connected to a 20 V battery.

The potential difference across the 3Ω resistor is:

120 V.

8 V.

12 V.

5 V.

A charge of 6.0 × 10⁻⁶ flows pas a point in a conductor in. 1.2 s.

The current in the conductor is:

1.2 × 10⁻⁶.

5.0 × 10⁻⁶.

7.2 × 10⁻⁶.

6.0 × 10⁻⁴.

The plug component that protects the appliance from overheating and eventual burning is:

The fuse.

The live wire.

The earth wire.

The neutral wire.

Which of the following is a pair of magnetic materials?

Copper and Iron

Silver and Gold.

Nickel and Cobalt.

Silicon and Steel.

The figure, shows a two parallel thin long wires AB and PQ, each carrying direct current.

It is observed that the wires move apart. The direction of current in the wires are:

AB and PQ.

BQ and PA.

BA and QP.

AB and QP.

The e.m.f. induced in a conductor is directly proportional to the rate of cutting of magnetic flux. This is a statement of:

Faraday’s law.

Fleming’s rule.

Lenz’s law.

Maxwell’s rule.

Which of the following graphs best illustrates the relationship between the temperature of a constantly heated bowl of ice at its melting point (y-axis) against time (x-axis)?

Which of the following actions will improve on the efficiency of a transformer?

Use of steel instead of iron as the core.

Superimposing the primary windings on the secondary windings.

Using DC instead of AC.

Use of thinner wire for the coil windings.

How long will it take for the activity of a radioactive sample, with a half-life of 4 years to drop from 8000 Bq to 1000 Bq.

32 years.

16 years.

12 years.

2 years.

The nucleus of an atom contains 94 neutrons and 240 nucleons. How many neutrons are in the atom?

334.

94.

240.

146.

Which of the following will produce an induced voltage across a wire?

Moving the wire from the North to the South Pole of a magnet.

Moving the wire to cut across magnetic field lines.

Holding the wire stationary inside a solenoid through which an alternating current is flowing.

Holding the wire stationary between the poles of a magnet.

One of a number of atoms that has the same proton number but different nucleon numbers refers to:

Isotopes.

An isotope.

Transmutation.

Isotopy.

Radiation from a radioactive sample is allowed to pass through a strong magnetic field. One of the radiations passed undeflected. Which is this radiation?

X-rays.

Alpha particles.

Beta particles.

Gamma rays.

Which of the following graphs best illustrates the relationship between:

the quantity of charge that flows through an n-type conductor (y-axis) and the potential difference across its ends (x-axis)?

Which of the following actions will increase the pitch of a note from a guitar string?

Replacing the string with a thicker one of the same material.

Tightening the string.

Increasing the length of the vibrating portion.

Striking the string harder.

A slinky spring is placed on a smooth horizontal table. One end is held in the hand and moved forward and backward, while the other end is left free. What type of wave will travel through it?

A transverse progressive wave.

A longitudinal stationary wave.

A transverse stationary wave.

A longitudinal progressive wave.

Which of the following is the approximate range of audible frequencies for the human ear?

20 Hz to 20000 Hz.

0.2 Hz to 200 Hz.

2 Hz to 2000 Hz.

200 to 200000 Hz.

During a funeral ceremony, a man makes a gun shot. His very close neighbor hears the echo of that sound from a cliff 0.6 seconds later. If the speed of sound in air is 320 ms⁻¹, how far is the cliff?

192 m.

96 m.

32 m.

64 m.

The Figure shows a ray of light moving from medium A to medium B.

The refractive index of medium B with respect to medium A is:

n = (sin 50) / (sin 70)

n = (sin 50) / (sin 20)

n = (sin 40) / (sin 20)

n = (sin 40) / (sin 70)

Which of the following accounts to the fact that a non-luminous body cannot be seen in the dark?

The light that falls on it is all reflected.

The light that falls on it is all absorbed.

Light does not fall on it at all.

The light that falls on it is all transmitted.

Which of the following graphs best illustrates the relationship between:

the number of undecayed atoms in a radioactive sample (y-axis) and the time (x-axis)?

An elusive pool of water often seen on tared roads on hot sunny days is called the mirage. Which wave phenomenon accounts of the formation of the mirage:

Dispersion of light by the air layers.

Reflection of light by the tared road.

The scattering of light by the dust particles.

Refraction of light by the air layers.

The electromagnetic radiation is stopped by bones:

Visible light.

X - rays.

Ultra-violet radiation.

Infra-Red radiation.

The figure shows a liquid-in-glass thermometer.

The thermometric property in this thermometer is the:

Volume of liquid in the thermometer.

Heat capacity of the liquid.

Cross sectional area of the glass bulb.

Length of liquid in the capillary tube.

The capillary tube is usually thin and uniform.

What two qualities of the thermometer do these respectively affect:

Sensitivity and durable.

Accuracy and Sensitivity.

Quick action and sensitivity.

Sensitivity and accuracy.

The length of the liquid column at 0 °C is 8 cm, at 100 is 38 cm and at a temperature T it is 18 cm. what is the temperature T?

50^o.

10^o.

33^o.

20^o.

One form of thermometers is the clinical thermometer, what is its range?

32 - 43 ^o.

32 - 100^o.

0 - 100^o.

0 - 43^o.

The figure shows a spring which is suspended and a load is hung at its lower end.

The extension of the spring in metres is:

10.

25.

0.03.

The spring is elastic.

Which of the following statements is NOT true.

When the 300 N is removed, the length will be 25 cm.

If the 300 N load is increased to 600 N the length will be 30 cm.

The extension is proportional to the deforming force.

The elastic limit is not yet exceeded.

Which of the following materials is elastic but does not obey Hooke’s law?

Rubber.

Glass.

Copper.

Aluminium.

A device that makes used of the elastic property of a spring is the:

Thermometer.

Newtonmeter.

Voltammeter.

Calorimeter.

It' i's revision time, take Physics - GCE O-Level 2018.

49/49 MCQs for:

GCE O-Level 2018.