Form 3 physics

Which quantity is measured in newtons?

• Density

• Energy

• Pressure

• Weight

A measuring cylinder is used to measure the volume of a quantity of water. Which measuring technique would not improve the accuracy of the measurement?

• making sure that the measuring cylinder is vertical

• making sure that the water surface is at eye level

• reading the top of the water meniscus

• using the smallest measuring cylinder available that will contain all the water

Two distance-time graphs and two speed-time graphs are shown. Which graph represents an object that is at rest?

• A

• B

• C

• D

An astronaut in an orbiting spacecraft experiences a force due to gravity. This force is less than

when she is on the Earth’s surface.

Compared with being on the Earth’s surface, how do her mass and her weight change when she

goes into orbit?

• mass decreases, weight decreases

• mass decreases, weight is unchanged

• mass is unchanged, weight decreases

• mass is unchanged, weight is unchanged

The diagram shows an experiment to find the density of a liquid. What is the density of the liquid?

• 0.5 g / cm³

• 2.0 g / cm³

• 8.0 g / cm³

• 10.0 g / cm³

An experiment is carried out to measure the extension of a rubber band for different loads.

The results are shown below. Which figure is missing from the table?

• 17.2

• 17.3

• 17.4

• 17.6

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 diagram shows a balance being used to find the weight of a baby. The weight of the basket

can be ignored.

At equilibrium, the pivot is nearer to the 40 N balancing weight than to the baby. What is the weight of the baby?

• less than 40 N

• 40 N

• more than 40 N

• impossible to tell without a scale on the beam

Which energy resource is used to boil water to generate electricity?

• hydroelectric

• nuclear fission

• tides

• waves

Very small pollen grains are suspended in a beaker of water. A bright light shines from the side.

Small, bright dots of light are seen through a microscope. The dots move in rapidly changing,

random directions. What are the bright dots?

• pollen grains being hit by other pollen grains

• pollen grains being hit by water molecules

• water molecules being hit by other water molecules

• water molecules being hit by pollen grains