PHYSICS REVISION

Choose the set of physical quantities which are only vectors.

• Force, mass, time, power

• Work, energy, weight, distance

• Force, distance, speed, acceleration

• Force, displacement, velocity, acceleration

The acceleration due to gravity experienced by an object falling depends on

• the mass of the object only.

• the mass of the object and the mass of the planet.

• the mass and radius of the planet only

• the mass and radius of the planet and the mass of the object.

Two boys are playing with a ball. One boy pulls the ball with a force of 1.5 N to the right and the other boy pulls the ball with a force of 2 N at a right angle to the first boy. The magnitude of the resultant force on the ball will be…

• 3,5 N

• 2,5 N

• 3 N

• 6,25 N

A box of 2,5 kg is being pulled with a force of 25 N at an angle of 300 to the horizontal, as shown in the diagram.

The normal force is ...

• 24,5 N.

• 12,5 N.

• 12 N.

• 37 N.

A net force applied to mass m will have an acceleration of a, if a ¼ F is now applied to half the mass, what will the acceleration be?

• ½ a

• ¼ a

• 2 a

• 4 a

The height above the surface of the earth at which an astronaut will experience only a third of the gravitational force to which he is subjected on earth, is ... times the radius of the earth

• 0,73

• 1,73

• 8

• 9

• F

• 3F

• 6F

• 9F

Which ONE of the following graphs best represents the relationship between

current and potential difference for a conductor which obeys Ohm's Law?

• A

• B

• C

• D

The electric field at a point is defined as …

• the region in space where an electric charge experiences an electrostatic force

• the electrostatic force per unit positive charge.

• directly proportional to the product of the charges.

• the direction that a negative test charge would move.

The cell in the circuit below delivers a potential difference of 1,5 V. The bulbs are identical and the current in the circuit is 0,2 A.

The energy, in joule, transferred by ONE of the bulbs in one minute is …

• 1,5 × 0,2 × 1

• 1,5 × 0,2 × 60

• 0,75 × 0,2 × 1

• 0,75 × 0,2 × 60