Teori Fisika 12 Juli 2021

Which quantity is measured in newton seconds (Ns)?

• Impulse

• Moment

• Power

• Work done

Which measurement can be made using a micrometer screw gauge?

• The air pressure of a tyre

• The diameter of a wire

• The turning effect of a spanner

• The wavelength of microwaves

Which statement about an object moving in a straight line through air is correct?

• When it accelerates, the resultant force acting on it is zero.

• When it moves at a steady speed, the air resistance acting on it is zero.

• When it moves at a steady speed, the resultant force acting on it is zero.

• When it moves, there is a resultant force acting on it.

The Sun is the original source of energy for many of our energy resources. Which energy resource does not originate from the Sun?

• Geothermal

• Hydroelectric

• Waves

• Wind

The resistance of a wire depends on its length l and on its cross-sectional area A. The resistance is....

• directly proportional to l and directly proportional to A.

• directly proportional to l and inversely proportional to A.

• inversely proportional to l and directly proportional to A.

• inversely proportional to l and inversely proportional to A.

Which list contains only transverse waves?

• infra-red waves, light waves, sound waves

• infra-red waves, light waves, ultraviolet waves

• infra-red waves, sound waves, ultraviolet waves

• light waves, sound waves, ultraviolet waves

A polythene rod repels an inflated balloon hanging from a nylon thread. Why do the rod and balloon repel?

• The rod and the balloon have opposite charges.

• The rod and the balloon have like charges.

• The rod is charged but the balloon is not.

• The balloon is charged but the rod is not.

Which frequency produces a sound that can be heard by a person?

• 2 Hz

• 10 Hz

• 2 kHz

• 30 kHz