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Delta Modern Language School Model test (2)
Grade 4
Date ......./......./………

(Q1) A– Choose the correct answer: -

1) A plugged-in lamp can turn …………. energy to………. energy.

a. electrical, light. b. chemical, light.

c. thermal, electrical. d. light, sound.

2) All the following are found deeply under the Earth’s surface, except……………...

a. natural gas b. coal. c. green plants. d. oil.

3)While playing a guitar, the ......... energy changes into sound energy.

(a) Kinetic. (b) light. (c) chemical. (d) potential.

4) Inside a light bulb, electrical energy changes into .......... energies
(a) Light – thermal. (b)Sound – light. (c)Sound – thermal. (d) Kinetic – light.

B-Give reason for the following:

1) Water plays an important role in formation of limestone caves.
………………………………………………………………………………………………

(Q2) (A) Put (√) or (×):

1) Sand dunes are formed by erosion only. ) (
(
2) Natural resources of energy which take a very long period of time to be formed. ) (
(
3) It is better to increase the number of blades of a turbine. )

4) Plane mirror helps in collecting and focusing sunlight to heat a metal pot. )

B-What happens if...?

1) The charge of remote-controlled toy car batteries is running out.
………………………………………………………………………………………………

(Q3) (A) Complete the following:

1) The dynamo changes the ………………. energy of the turbines into ……………energy.
2) An equipment that helps farmers in planting crops that need hot water in water is………...
3) Wind erosion can crave the ……………… into different forms.
4) In electric heater, ………. energy is considered as input energy, while thermal energy is
considered as……………energy.

B-Arrange the following steps to show how electricity is generated in electric power
station and sent to houses and factories:

(…….) Steam turns turbines that produce kinetic energy.
(……) Fuel burns and produces thermal energy.
(……) Electrical energy sent to houses and factories.
(.…...) Turbines turn generators that produces electrical energy.

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