radiation

radiation

7th Grade

10 Qs

quiz-placeholder

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Assessment

Quiz

Physics

7th Grade

Hard

Created by

思奇 吴

Used 1+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The radiators on motor cars are painted black because ________.

black surface is more beautiful

a black surface can conduct heat better

a black surface is a good radiator of infra-red rays

it will not get dirtt easily

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

By which process is thermal energy transferred through a vacuum?

conduction only

convection only

conduction and convection only

radiation only

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which type of surface is the best absorber of infra-red rays?

black and rough

black and smooth

white and rough

white and smooth

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

We feel the intense heat from the Sun when we stand in the open during noon time. How is heat transferred from the Sun to the Earth?

By radiation only.

By conduction and radiation only.

By convection and radiation only.

By conduction, convection and radiation.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A teapot is needed to keep tea hot for a long period of time. Which of the following best explains why teapots are usually made of a shiny metal?

Shiny surfaces are good absorbers of infra-red radiation.

Shiny surfaces are good emitters of infra-red radiation.

Shiny surfaces are poor absorbers of infra-red radiation.

Shiny surfaces are poor emitters of infra-red radiation.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

Four different closed vessels contain equal amounts of ice.


Which vessel would take the shortest time for all the ice to melt?

A

B

C

D

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Media Image

The diagram shows a vacuum flask.

The main reason for the vacuum is to reduce heat transfer by

conduction and convection.

conduction only.

radiation only.

convection only.

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