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IS online_test_unit09a

Chapter 9 Space Travel

  1. When a nail is pulled out of a wooden board, the nail becomes warm because

(1)potential energy of the nail changed into heat.

(2)friction between the nail and the wooden board produces heat.

(3)chemical energy of the wooden board changes into heat.

(A)(1) only

(B)(2) only

(C)(1) and (3) only

(D)(2) and (3) only

  1. The diagram below shows three persons holding a rod standing at three different places on Earth. If the three persons drop the rods, gravity will make the rods fall.

Which of the following diagrams best shows the direction in which the dropped rods will fall?

(A)(B)

(C)(D)

  1. Which of the following ways can reduce the friction between two surfaces?

(1)Separate the surfaces with an air cushion

(2)Separate the surfaceswith lubricant

(3)Insert rollers between the surfaces

(A)(2) only

(B)(1) and (2) only

(C)(2) and (3) only

(D)(1), (2) and (3)

  1. When you squeeze a sponge, the force applied changes the sponge’s

(A)mass.

(B)speed.

(C)direction of motion.

(D)shape.

  1. Two blocks P and Q are connected by a string that passes over a pulley as shown.

If the frictional force acting on block P is 20 N, and block Q is stationary. What is the weight of block Q?

(A)10 N

(B)20 N

(C)40 N

(D)cannot be determined

  1. All objects below have the same density and same size. Which of the objects will sink at the slowest rate if they are dropped into a tank of water?

(A)(B)

(C)(D)

  1. The photo below shows a space shuttle moving upwards.

What is the energy change of the space shuttle?

(A)Heat energy  potential energy + kinetic energy + light energy

(B)Chemical energy  heat energy + kinetic energy + light energy

(C)Heat energy  light energy + kinetic energy + sound energy

(D)Chemical energy  potential energy + kinetic energy + heat energy + light energy + sound energy

  1. Which of the following parts of a spacesuit can protect an astronaut by reflecting radiation?

(A)life support backpack

(B)outermost layer

(C)liquid cooling underwear

(D)layers of airtight and insulating materials

  1. The following diagram shows a spacecraft landing on the moon.

Which of the following statements is/are correct?

(1)Gravitational force pulls the spacecraft downwards.

(2)Air resistance opposes the motion of the spacecraft.

(3)The spacecraft’s engine is fired to slow the spacecraft down.

(A)(1) only

(B)(2) only

(C)(1) and (3) only

(D)(2) and (3) only

  1. The following diagram shows how a frog’s leg pushes the ground to jump forward. Which of the following red arrows shows the direction of the reaction acting on the leg of the frog?

  1. The Earth holds the Moon in orbit by

(A)frictional force.

(B)repulsive force.

(C)gravitational force.

(D)magnetic force.

  1. Which of the following statement is correct.

(A)Theweight of an object on the moon is the same as that on the Earth.

(B)The mass of an object on the moon is the same as that on the Earth.

(C)The weight and the mass of an object on the moon is the same as that on the Earth.

(D)The weight and the mass of an object on the moon are both different from that on the Earth.

  1. Heat is transferred along an iron bar from the hotter part to the colder part mainly by

(A)convection.

(B)radiation.

(C)conduction.

(D)gravity.

  1. Which of the following statements about the design of rockets is/are correct?

(1)They have a streamlined shape to reduce air resistance when moving in space.

(2)They carry their own oxygen supply to burn fuel.

(3)They usually have multi-stage design so that the stage can be dropped off when the fuel in it is used up.

(A)(1) only

(B)(1) and (2) only

(C)(2) and (3) only

(D)(1), (2) and (3)

  1. A force can

(1)change the shape of an object.

(2)make a stationary object move.

(3)stop the motion of a moving object.

(A)(1) and (2) only

(B)(1) and (3) only

(C)(2) and (3) only

(D)(1), (2) and (3)

  1. Which of the following is/are non-contact force(s)?

(1)gravitational force

(2)frictional force

(3)magnetic force

(A)(1) only

(B)(2) only

(C)(1) and (3) only

(D)(2) and (3) only

  1. Heat is transferred from the Sun to the Earth by

(A)gravitational force.

(B)friction.

(C)radiation.

(D)conduction.

  1. Action and reaction

(A)have different sizes and act in the same direction.

(B)have different sizes and act in opposite directions.

(C)have the same size and act in the same direction.

(D)have the same size and act in opposite directions.

  1. In which of the following activities can we experience motion similar to frictionless motion?

(1)air hockey game

(2)running

(3)ice-skating

(A)(1) only

(B)(2) only

(C)(1) and (3) only

(D)(2) and (3) only

  1. Which of the following is/are (a) spin-off product(s) of space technology?

(1)bar code system

(2)sun glasses

(3)smoke detector

(A)(1) only

(B)(2) only

(C)(1) and (3) only

(D)(2) and (3) only

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