It' i's revision time, take Physics

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It' i's revision time, take Physics - GCE O-Level 2021.

37/37 MCQs for:

GCE O-Level 2021.

Which of the following values below represents momentum?

20 kg m/s.

20 Nm.

20 N.

20 Pa.

The base unit of length is the:

kilometre.

Millimetre.

centimetre.

Metre.

Which of the following pairs are all scalar quantities?

Velocity and force.

Displacement and speed.

Work and time.

Momentum and distance.

Which of the graphs in the figure I best represents the relationship between the acceleration of a moving car and its mass, when the force acting on the car is constant?

Which of these units is equivalent to joule per coulomb (J/C)?

volt.

ampere.

ohm.

watt.

For a body to stay in equilibrium:

the net force and the sum of the moments must be zero.

the net force must be zero.

the net force must be greater than the sum of moments.

the upward forces must be equal to the sum of the downward forces.

In a velocity-time graph the area between the graph and the time axis gives:

total acceleration.

total work done.

total distance covered.

total momentum.

Seat belts reduce injury on users the case of accidents by:

increasing the stopping time and reducing the stopping force.

reducing the stopping time and reducing the stopping force.

increasing the stopping time and increasing the stopping force.

reducing the stopping time and increasing the stopping force.

Which of these energy resources is non-renewable?

Tidal energy.

Biomass.

Solar energy.

Petroleum.

Which of the following pairs of forces are both non-contact forces?

Magnetic force and weight.

Air resistance force and electrostatic force.

Weight and upthrust.

Electrostatic force and friction force.

A ball of mass 0.5 kg travelling at 10 m/s has kinetic energy of:

2.5 J.

25 J.

5 J.

50 J.

What type of energy is stored in a compressed spring?

Chemical energy.

Gravitational potential energy.

Elastic potential energy.

Kinetic energy.

The density of a substance is the:

volume of a unit mass of the substance.

mass of 1 kg of the substance.

mass of 1 g of the substance.

mass of a unit volume of the substance.

The hydraulic jack works on the principle that the:

force applied to a liquid is transmitted equally to every part of the liquid.

pressure applied to a liquid is transmitted equally to every part of the liquid.

force applied to a liquid is transmitted in proportion to the area of contact.

pressure applied to a liquid is transmitted in proportion to the area of contact.

What is the pressure, in pascals, in a liquid of density 1000 kg/m³, at a depth of 10 m?

10⁻¹.

10⁴.

10⁵.

10⁻³.

Which of the graphs in the figure shows how the pressure at a given depth varies with the depth of the liquid?

Absolute zero (0 K) is the same as a Celsius temperature of:

32°C.

273 °C.

-273 °C.

0 °C.

Water is used in car radiators because it has a:

high heat capacity.

high boiling point.

low melting point.

high latent heat of evaporation.

During the night the temperature of the sea water is higher than that of the sandy sea shore. This is because sea water:

is a better absorber of heat than sand.

has a higher heat capacity than sand.

is a poorer radiator of heat than sand.

has a lower heat capacity than sand.

The specific latent heat of fusion of a substance is the amount of heat energy needed to convert:

a unit mass of the substance from solid to liquid at constant temperature.

1 kg of the substance from solid to liquid at constant temperature.

1 kg of the substance from liquid to gas at constant temperature.

a unit mass of the substance from liquid to gas at constant temperature.

Heat from the Sun reaches the Earth by:

convection only.

radiation only.

conduction and convection.

convection and radiation.

When measuring the specific heat capacity of liquids the calorimeter and its contents is lagged so as to:

ensure good electrical contact.

ensure even distribution of heat.

measure accurate temperature changes.

minimise heat exchange with environment.

Dust particles often stick on television screens because the:

dust particles become charged and so attract the uncharged television screens.

television screens, whether charged or not, attract dust particles.

television screens become charged and so attract the uncharged dust particles.

television screens become charged and so attract the oppositely charged dust particles.

Electrical power is transmitted at high voltage in thick copper cables:

so as to keep power loss along the cable as low as possible.

so as to maintain a high voltage up to the consumer end.

so as to discourage people from stealing the cables along the way.

because transformers will step down the voltage to any level at the consumer end.

The effective voltage of electrical energy supplied to our homes by ENEO is:

220 V.

110 V.

340 V.

250 V.

When we pay electricity bills, what are we paying for?

Energy consumption.

Voltage consumption.

Power consumption.

Electricity consumption.

A voltmeter is connected in a circuit as shown in the figure. The voltmeter is connected as such because it has a very:

low resistance and so draws low current.

high resistance and so draws high current.

low resistance and so draws high current.

high resistance and so draws low current.

In drawing of magnetic field lines, the stronger the field is the:

more divergent the field lines are.

closer together the field lines are.

more parallel the field lines are.

farther apart the field lines are.

An optical pin is placed between the principal focus and the optical centre of a converging lens The image formed is:

virtual and smaller than the object.

real and smaller than the object.

real and bigger than the object.

virtual and bigger than the object.

Soft iron is used as the core of electromagnet because it is:

easy to magnetise and easy to demagnetise.

easy to magnetise but difficult to demagnetise.

difficult to magnetise and difficult to demagnetise.

difficult to magnetise but easy to demagnetise.

Which of the following is best suited for making the core of a transformer?

Iron.

Aluminium.

Steel.

Copper.

A bar magnet with known poles is used to study the properties of a bar AB. If the south pole of the bar magnet attracts end A and also attracts end B of the bar, then the:

north pole of the magnet will repel both ends of the bar AB.

bar AB is a magnet.

bar AB is a non-magnetic material.

bar AB is a magnetic material.

The core of transformers are usually laminated in order to minimise heat loss due to:

eddy currents.

resistance of copper.

magnetic reversals.

flux leakage.

The tracks produced by alpha particles in a cloud chamber are:

straight, short and thin.

wavy, long and thick.

straight, long and thin.

straight, short and thick.

Which symbol represents an alpha particle?

²₄He.

²₄He²⁻.

²₇α²+.

²₄α.

When trivalent atoms are added to a semiconductor, its conductivity increases. This process is called:

transformation.

rectification.

transmutation.

doping.

The figure shows an electromagnet designed to pick up some metallic objects and released elsewhere.

A suitable material for the core X is:

Steel.

Copper.

Wood.

Iron.