SCIENCE REVISION BANK TERM 1

 

Revision Question Bank 1 (2021-22)

Std: VII Subject: Science

Section A

1. Neha added a few drops of red cabbage indicator to a test tube containing
vinegar.
Which of the following changes will be observed in the colour of the red
cabbage indicator?
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(a) The red colour of the indicator changes to pink.
(b) The red colour of the indicator changes to green.
(c) The purple colour of the indicator changes to red.
(d) The purple colour of the indicator changes to green.

2. Which of the following statement/s is/are true?
Statement 1: The formation of a precipitate is the indication of a chemical
reaction.
Statement 2: When a cake is baked it releases heat.
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(a) (b) (c) (d)

Only statement 1 is true. Only statement 2 is true. Both statements 1 and 2 are true. Neither statement 1 and nor statement 2 are true.

3. The part labelled as ‘X’ in the given diagram of the respiratory system of a
grasshopper represents:

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(a) trachea
(b) spiracle
(c) operculum
(d) nostril

4. Study the given passage and answer the following question. 1
A distance-time graph is a way of representing the motion of an object in the
form of a graph. The given distance-time graph illustrates how far a car moved
and how long it took to reach that far

.
How much distance was covered by the car in 30 minutes?

(a) (b) (c) (d)

48 km 54 km 40 km 60 km

5. Study the given passage and answer the following question. 1
A distance-time graph is a way of representing the motion of an object in the
form of a graph. The given distance-time graph illustrates how far a car moved
and how long it took to reach that far.

Which of the given statement/s best describes this graph?
I. The car covered equal intervals of distance in equal intervals of time.
II. This graph is an example of a non-uniform motion.
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I and nor II

Section B

6. (a) For question number (i) and (ii), two statements are given- one labelled
Assertion (A) and the other labelled Reason (R). Select the correct
answer to these questions from the codes (I), (II), (III) and (IV) as given
below:

(I) (II)	Both A and R are true, and R is correct explanation of the assertion. Both A and R are true, but R is not the correct explanation of the assertion.
(III) A is true, but R is false. (IV) A is false, but R is true.
(i)	Assertion: Arteries have thick walls.

Reason: Arteries contain blood flowing under high pressure.
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(ii) Assertion: A wasp’s sting can be neutralised with baking soda.
Reason: A wasp’s sting is basic in nature.
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(b) (i) How many ATP molecules are released in aerobic respiration? 1
(ii) Name any two metals that can be mixed with iron to make
stainless steel.
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(iii) Name the thick, vertical muscular wall that divides the heart into
two parts.
1
7. A bus starts at 5 am. It travels with a speed of 30 kilometres for the first hour,
and then travels with a speed of 40 kilometres for the next hour. Find its
average speed.
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8. Give reason for the following statements: 3

(a)	The opening of the left atrium into the left ventricle is guarded by the bicuspid valves.

(b) White blood cells are called soldiers of the body.
(c) It is necessary to remove waste products from the body.

9. (a) Define the following. 5
(i) Reactants
(ii) Physical change
(b) State three ways used to prevent rusting.