CSEC Physics Paper 1 May/June 2021 - Free CXC Past Paper with Answers

Power can be defined as

force × distance moved

Errors due to parallax can be minimized by

taking more than one reading

placing the eye at a right angle to the mark being read

taking readings from different angles

taking an average of two readings using two separate scales

Which of the following pairs consist(s) of fundamental quantities? I. Mass and weight II. Mass and length III. Time and current

Item 4 refers to the following diagram. which shows two forces, X and Y, applied onto an object.

What should be the magnitude and direction of a third force which would cause the object to remain stationary?

Item 5 refers to the following diagram which shows three forces of magnitudes L, M and N, all in the same plane and applied on a ring.

Which of the following equations must be true in order for the ring to remain stationary?

Which of the following changes can be caused by a force acting on a body? I. Shape II. Motion III. Density

Item 7 refers to the following diagram which shows two different sized containers, P and Q, with water at different levels, connected by a glass tube and controlled by a tap.

When the tap is opened, water will flow from P to Q until

the water level of Q is at X

container P is empty

the water level of P is at Y

the water levels of P and Q are equal

Item 8 refers to the following graph of a light spring which shows a simple extension, x, versus force, F.

Which of the following statements is/are true? I. The elastic limit of the spring was exceeded. II. The spring obeyed Hooke's law over its entire extension. III. The force per unit extension in the elastic region is 7.5 N cm⁻¹

The kinetic energy of a body of mass, m, and velocity, v, is given by

Which of the following will be constant, if a constant net force is applied to a body?

Which of the following sets of units will result in the SI unit of pressure?

g cm³ / m s⁻² / mm

kg m³ / N kg⁻¹ / m

g cm⁻³ / N kg⁻¹ / m

kg m³ / cm s⁻² / cm

An ice cube sinks in Liquid A but floats in Liquid B. Which of the following statements is true of Liquid A and Liquid B?

The upthrust is less in Liquid A than in Liquid B.

The upthrust is greater in Liquid A than in Liquid B.

The weight of the ice cube is less in Liquid A than in Liquid B.

The weight of the ice cube is greater in Liquid A than in Liquid B.

The pressure on the dam at the bottom of the reservoir depends on the

mass of water held back by the dam

volume of water held by the dam

length of the reservoir

Which of the following is an SI base unit?

From the graph it can be deduced that the runner is

going slower and slower

going at a steady speed

going faster and faster

Two forces of 8 N and 10 N CANNOT give a resultant of

A piece of string is tied onto a small stone and the stone is then suspended, totally im- mersed, in water. The tension in the string will be

equal to the weight of the stone

less than the weight of the stone

more than the weight of the stone

What is the gain in the gravitational potential energy of a body of weight 200 N, as it rises from a height of 30 m to a height of 35 m above the earth's surface?

Who was responsible for arriving at the conclusion that measured amounts of electrical and mechanical energy can be converted to proportionate amounts of heat energy?

A metal of mass m requires energy, E, to raise its temperature from T, to T,. The specific heat capacity of the metal will be given by

$\frac{Em}{(T_1 - T_2)}$

$\frac{E}{m(T_1 - T_2)}$

$\frac{E}{m(T_2 - T_1)}$

The specific latent heat of vaporization of water is 2.26 × 10⁶ J kg⁻¹. When 0.01 kg of water is converted into steam it

absorbs 2.26 × 10⁴ J

gives out 2.26 × 10⁴ J

absorbs 2.26 × 10⁸ J

gives out 2.26 × 10⁸ J

A gas occupies 2 m³ at 27 °C at a pressure of 1 atmosphere. At a pressure of 2 atmospheres it occupies a volume of 1 m³. What is its temperature at this new volume and pressure?

Which of the following statements about evaporation is FALSE?

Evaporation occurs only at the surface.

Evaporation requires heat energy and causes cooling.

In evaporation the faster molecules escape the liquid.

Evaporation occurs at room temperature only.

Which of the following is the POOREST conductor of thermal energy?

Some molten naphthalene at 100 °C is allowed to cool to room temperature. If naphthalene has a melting point of 80 °C, which of the following graphs BEST represents the cooling curve of naphthalene?

An electric kettle full of water is plugged into the mains. The MAJOR process by which heat travels through the water is

Which of the following are reasons why a hot liquid, placed in a double-walled vacuum flask, retains its heat for a long time? I. Evacuated space between the double walls reduces the loss of heat by conduction. II. Silvered inner walls reduce the loss of heat by radiation. III. The silvered outer wall helps to absorb heat from the surroundings.

As the temperature of a liquid rises

its density increases

the kinetic energy of its molecules increases

the forces between its molecules increase

the pressure it exerts at the bottom of the container increases

A light bulb is filled with a gas at a temperature of 293 K. If the initial pressure of the gas is P, what will the pressure be when the temperature increases to 360 K?

$\frac{393}{360} \times P$

$\frac{360}{393} \times P$

$\frac{293}{360} \times P$

$\frac{360}{293} \times P$

Which of the following statements explains the reason for this occurrence?

Water is a poor conductor of heat.

Gauze is a poor conductor of heat.

Water is a good conductor of heat.

Glass is a good conductor of heat.

Which of the following diagrams illustrates the law of reflection?

Diagram showing incident ray, reflected ray, normal, and angles of incidence and reflection.

The human ear is incapable of hearing a silent dog whistle because

the dog whistle does not make a noise

the speed of sound is too fast to be detected by the human ear

the frequency of the waves are above the range detected by the human ear

the waves are infrasound with frequencies below that detectable by the human ear

An echo is quieter than the original sound that produced it. This shows that, compared to the original sound, the echo has a

Item 34 refers to the following diagram which shows a longitudinal wave, where C and R represent compressions and rarefactions respectively. C₁ R₁ C₂ R₂ C₃ R₃ C₄

If λ = wavelength, the distance between C₁ and R₂ is

$\frac{1}{2}\lambda$

$1\frac{1}{2}\lambda$

A ray of light leaving air enters glass of refractive index 1.6. The angle of refraction is 27°. What is the sine of the angle of incidence?

$1.6 + \sin 27^{\circ}$

$\frac{1.6}{\sin 27^{\circ}}$

$\frac{\sin 27^{\circ}}{1.6}$

$1.6 \sin 27^{\circ}$

Which of the following diagrams BEST represents the wave generated in a ripple tank by a small spherical dipper vibrating at a constant frequency?

Which of the following statements about waves is true?

Only transverse waves undergo reflection.

Diffraction can only take place with light waves.

All waves undergo reflection, refraction and diffraction.

Longitudinal waves do not undergo refraction, but may be reflected.

Which of the following objects can detect X-rays?

A ray of light in air strikes a glass block at an angle of incidence of 0°. The light will be

refracted at 90° to normal

refracted at an unknown angle

The position of an image formed by a plane mirror depends on the

distance of the observer from the mirror

distance of the object from the mirror

angle at which the image is viewed

angle at which the object is viewed

The refractive index of a transparent medium with a critical angle, c, for light travelling from the medium to air is

$\frac{90^\circ}{\sin c}$

$\frac{\sin 90^\circ}{\sin c}$

Which of the following diagrams is a graphical representation of current versus potential difference for a metallic conductor at a constant temperature?

When a polythene rod is rubbed with a cloth, it becomes

positively charged by gaining protons

negatively charged by gaining electrons

positively charged by gaining electrons

negatively charged by losing protons

Which of the following relationships between electrical quantities is correct?

Item 45 refers to the following circuit where the ammeter reads 0.4 A and the voltmeter reads 0.6 V.

What is the resistance of R?

Item 46 refers to the following diagram.

Two light aluminium spheres, A and B, are suspended by insulating threads. If they come to rest as shown in the diagram, the force keeping them apart is

Which of the following current (I)-time (t) graphs BEST represents a d.c. current?

Graph shows a sinusoidal wave oscillating around the t-axis.

Graph shows a square wave oscillating around the t-axis.

Graph shows a triangular wave oscillating around the t-axis.

Graph shows a sinusoidal wave oscillating around the t-axis.

Appropriate labels for W and X are

step-down transformer / a.c. input

step-down transformer / d.c. input

step-up transformer / a.c. input

step-up transformer / d.c. input

Rectification is BEST done by using a

The parts labelled X in the diagram are known as the

Which of the following materials is MOST suitable for the core of an electromagnet?

Item 55 refers to the following diagram of a portion of the periodic table.

In the diagram above, Element F has 9 protons. How many protons does Element B have?

The number of neutrons present in the nucleus of the nuclide $_{86}^{222}$ Rn is

Which of the following CANNOT be deflected by a magnetic field?

Sodium-24 decays into Magnesium-24 with the emission of a $\beta$ -particle and can be represented by the following equation.

$_{11}^{24}$ Na $\rightarrow$ $_{12}^{24}$ Mg + ?

Which of the following options should be placed in the box to complete the equation?

Which of the following scientists discovered radium?

A radioactive isotope has a half-life of 20 days. How many days will it take for a given sample to have its activity reduced to $\frac{1}{8}$ of its initial value?

CSEC Physics Paper 1 May/June 2021 - Free CXC Past Paper with Answers

CSEC Physics Paper 1 May/June 2021 Questions