Multiple choice

What statement is not correct about an electromagnetic wave?

A. It can be diffracted

B. It can be polarised

C. It is a longitudinal wave

D. It can travel through a vacuum

C

A ball, initially at rest is struck by a hockey stick. It leaves the hockey stick at speed v.

What quantity, together with the mass of the ball, can be used to determine v?

A. the time of impact

B. The weight of the hockey stick.

C. The impulse of the force.

D. The final momentum of the hockey stick.

C- the impulse
Need F to find v, I= mv

A potential divider circuit with an LDR and resistor experience a lowered light incident on the LDR.

Which describes the observed change on the ammeter and voltmeter readings?

A. A decreases, V decreases

B. A decreases, V increases

C. A increases, V stays the same

D. A stays the same, V decreases

A. Ammeter reading decreases, Voltmeter reading increases

A cable is attached to an object of weight 30N. The object is pulled vertically upwards with an acceleration of 6.0ms-2

What is the tension in the cable?

A. 12N

B. 18N

C. 30N

D. 48N

D. 48 N

(T= mg, F= ma)

30 + (3 × 6)