Question 1

What defines a scalar quantity?

Accepted Answer

A scalar is a quantity that has magnitude only.

Answer

A scalar is a quantity that has no units.

Answer

A scalar is a type of vector that only acts in one direction.

Answer

A scalar has both magnitude and direction.

Question 2

What is the unit of density?

Accepted Answer

kg m−3 or g cm−3

Answer

m s−2

Answer

J kg−1

Answer

N m−2

Question 3

For a body to be in equilibrium, what must be true about the moments acting on it?

Accepted Answer

The sum of anticlockwise moments must equal the sum of clockwise moments.

Answer

All forces must be equal in magnitude.

Answer

The total force must be greater than zero.

Answer

The center of gravity must lie below the base.

Question 4

What does the term 'moment' refer to in physics?

Accepted Answer

The moment of a force is defined as the force multiplied by the perpendicular distance from the point to the line of action of the force.

Answer

The force exerted on an object in motion.

Answer

The product of mass and acceleration.

Answer

The speed of an object at a particular moment.

Question 5

What is the principle of conservation of momentum?

Accepted Answer

The vector sum of the momenta of bodies in a system stays constant provided there is no external resultant force.

Answer

Momentum can be created in closed systems.

Answer

Momentum is always conserved in any collision.

Answer

The total momentum is only conserved in elastic collisions.

Question 6

What happens to a gas when its temperature is increased, assuming the pressure stays constant?

Accepted Answer

The volume of the gas increases.

Answer

The pressure increases.

Answer

The mass of the gas decreases.

Answer

The density increases.

Question 7

What is the unit of power?

Accepted Answer

W (watts) or J s−1

Answer

C V

Answer

J kg−1

Answer

N m

Question 8

What is Hooke's law?

Accepted Answer

The tension in a spring is proportional to its extension from its natural length, provided the extension is not too great.

Answer

The extension of a spring is dependent on its mass.

Answer

A spring will always return to its original length.

Answer

The force exerted by a spring is constant.

Question 9

How is electric current defined?

Accepted Answer

Electric current is the rate of flow of electric charge.

Answer

The voltage divided by resistance.

Answer

The amount of charge per second.

Answer

The potential energy per unit charge.

Question 10

What is the significance of a black body in physics?

Accepted Answer

A black body is a perfect absorber of all electromagnetic radiation.

Answer

It is a theoretical concept with no practical applications.

Answer

It emits radiation at a constant temperature.

Answer

It reflects all radiation falling on it.

Question 11

What is a scalar quantity?

Accepted Answer

A scalar is a quantity that has magnitude only.

Answer

A scalar is a force acting in one direction.

Answer

A scalar is a measurement of energy.

Answer

A scalar is a quantity that has both magnitude and direction.

Question 12

What does the principle of conservation of energy state?

Accepted Answer

Energy cannot be created or destroyed, only transferred from one form to another.

Answer

Energy can be transformed but not transferred.

Answer

Energy can be produced from nothing.

Answer

Energy can be created and destroyed.

Question 13

What is the relationship defined by Newton's second law?

Accepted Answer

The mass of a body multiplied by its acceleration is equal to the vector sum of the forces acting on the body.

Answer

Velocity equals distance divided by time.

Answer

Force equals mass times velocity.

Answer

Force equals mass divided by acceleration.

Question 14

What is terminal velocity?

Accepted Answer

The constant, maximum velocity of an object when resistive forces are equal and opposite to the accelerating force.

Answer

The speed at which an object begins to fall.

Answer

The highest speed an object can reach when accelerating.

Answer

The velocity of an object when it is at rest.

Question 15

What is density?

Accepted Answer

Density is mass divided by volume.

Answer

Density is the weight of an object.

Answer

Density is volume divided by weight.

Answer

Density is mass multiplied by volume.

Question 16

What does the moment of a force depend on?

Accepted Answer

The moment is defined as the force multiplied by the perpendicular distance from the point to the line of action of the force.

Answer

The moment is the total weight of the object.

Answer

The moment is the speed of the object.

Answer

The moment is defined as the mass of an object.

Question 17

What does Ohm's law state?

Accepted Answer

The current in a metal wire at constant temperature is proportional to the potential difference across it.

Answer

Resistance increases with temperature.

Answer

Voltage is independent of current.

Answer

The resistance is constant regardless of temperature.

Question 18

What is the definition of power in physics?

Accepted Answer

Power is the work done per second.

Answer

Power is the energy transferred per unit mass.

Answer

Power is the speed of an object's movement.

Answer

Power is the force applied per distance.

Question 19

What is meant by the term 'black body' in physics?

Accepted Answer

A black body absorbs all electromagnetic radiation that falls on it.

Answer

A black body reflects all electromagnetic radiation.

Answer

A black body is a perfect insulator.

Answer

A black body emits radiation only at low temperatures.

Question 20

What is a scalar quantity?

Accepted Answer

A scalar is a quantity that has magnitude only.

Answer

A scalar is a quantity that measures the rate of change.

Answer

A scalar is a quantity with magnitude and direction.

Answer

A scalar is a force that acts on a body.

Question 21

What does the principle of moments state?

Accepted Answer

For a system to be in equilibrium, the sum of anticlockwise moments about a point equals the sum of clockwise moments about the same point.

Answer

The total weight of a system must equal zero.

Answer

The resultant force must be zero.

Answer

All forces acting on a body must cancel each other out.

Question 22

What defines density?

Accepted Answer

Density is mass divided by volume.

Answer

Density is volume divided by mass.

Answer

Density is mass multiplied by volume.

Answer

Density is weight divided by area.

Question 23

What is the unit of work done by a force?

Accepted Answer

The unit of work is the Joule (J).

Answer

The unit of work is the Pascal (Pa).

Answer

The unit of work is the Newton (N).

Answer

The unit of work is the Watt (W).

Question 24

What does the term 'momentum' refer to?

Accepted Answer

Momentum is the product of mass and velocity.

Answer

Momentum is the energy of an object in motion.

Answer

Momentum is the sum of forces acting on an object.

Answer

Momentum is the rate of change of acceleration.

Question 25

What is an elastic collision?

Accepted Answer

An elastic collision is one in which there is no change in total kinetic energy.

Answer

An elastic collision is one where objects stick together.

Answer

An elastic collision is one in which momentum is not conserved.

Answer

An elastic collision is one where some energy is transformed into heat.

Question 26

What is the definition of the term 'power'?

Accepted Answer

Power is the work done per unit time.

Answer

Power is the force applied per unit area.

Answer

Power is the change in energy per unit mass.

Answer

Power is the energy transferred per unit distance.

Question 27

What does Hooke's law state?

Accepted Answer

Hooke's law states that the tension in a spring or wire is proportional to its extension.

Answer

Hooke's law states that energy is constant in a closed system.

Answer

Hooke's law states that force is proportional to mass.

Answer

Hooke's law states that pressure is inversely proportional to volume.

Question 28

What characterizes a black body in physics?

Accepted Answer

A black body absorbs all electromagnetic radiation that falls on it.

Answer

A black body emits only visible light.

Answer

A black body is at a constant temperature.

Answer

A black body reflects all radiation.

Question 29

What is the unit of electric current?

Accepted Answer

The unit of electric current is the Ampere (A).

Answer

The unit of electric current is the Volt (V).

Answer

The unit of electric current is the Watt (W).

Answer

The unit of electric current is the Joule (J).

Related quizzes

Related quizzes