Sec 2 Challenge 3

The diagram shows two resistors connected to a battery. The currents in different parts of the circuit are indicated.

What is the current at point P?

• 2.0 A

• 4.0 A

• 8.0 A

• 14 A

Which of these diseases can be cured with antibiotics?

• A

• B

• C

• D

A block of metal is taken from the Earth to the Moon.

Which property of the block changes?

• Density

• volume

• mass

• weight

The diagram shows four labelled changes of state between solid, liquid, and gas.

Which changes needs an energy input?

• P and Q

• Q and R

• R and S

• S and P

The circuit of a car racing track is 3 km in length. In a race, a car goes 25 times round the circuit in 30 minutes. What is the average speed of the car?

• 75 km/hour

• 90 km/hour

• 150km/hour

• 750 km/hour

The diagram shows a food web.

Which statement about this food web is correct?

• Some of the energy from the grass eventually passes to the hawk.

• The producers get their energy from the soil.

• There are more carnivores shown than herbivores.

• There are six consumers shown

The table gives four combinations of the force applied to a surface and the area over which it acts. Which row gives the smallest pressure exerted on the surface?

• A

• B

• C

• D

A spring can be stretched by hanging masses on it. Which of the following is true?

• The larger the force, the greater the stretch

• The smaller the force, the greater the stretch

• The larger force ,the lesser mass

• The weight does not exert a force on the spring

Heat transfers for an area of ______ temperature to an area of _______ temperature.

• high to low

• low to high

• high to high

• low to low

Small gaps are left between the metal rails on railway tracks in order to allow for ….

• contraction of the metal rails on cold days

• expansion of the metal rails on cold days

• contraction of the metal rails on hot days

• expansion of the metal rails on hot days