NSO Level 2 Class 7 Science Paper 2015 − 16 Higher Questions and Answers Part 2

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Question 9:

Rihan takes an empty half litre plastic bisleri bottle. He opens the lid and fixes his mouth on the opening in such a way that there is no gap between the opening and his mouth. He observes that the bottle crushes inwards when he sucks some air out of the bottle. Which of the following statements is the reason for Rihan՚s observation?

(A) Air pressure inside the bottle increases.

(B) Air pressure outside the bottle increases.

(C) Air pressure inside the bottle decreases.

(D) Air pressure outside the bottle decreases.

Question 10:

Which of the following properties of light are made use of in the periscope shown here?

(i) Light travels very fast.

(ii) Light can be reflected.

(iii) Light travels in a straight line.

(A) (i) and (ii) only

(B) (i) and (iii) only

(C) (ii) and (iii) only

(D) (i) , (ii) and (iii)

Question 11:

Which of the following statements is/are correct?

(i) Longer line in the symbol for a cell represents its negative terminal.

(ii) The combination of two or more batteries is called a cell.

(iii) Fuse wire is made up of alloys which has high melting point.

(iv) Electromagnet loses its magnetism when the current flowing through it is switched off.

Electromagnet

(A) (iv) only

(B) (ii) and (iii) only

(C) (i) , (ii) and (iv) only

(D) (i) , (ii) , (iii) and (iv)

Question 12:

Match the column I with column II and select the correct option from the given codes.

Match the Column I with Column II and Select the Correct Option from the Given Codes
Column IColumn II
P1 solar day1. microseconds
QSecond2. days
RMillennium3. hours
SDecade4. minutes
TYear5. years

(A) P - 1, Q - 4, R - 5, S - 3, T - 2

(B) P - 1, Q - 3, R - 2, S - 5, T - 4

(C) P - 4, Q - 1, R - 5, S - 2, T - 3

(D) P - 4, Q - 2, R - 3, S - 5, T – 1

Question 13:

Which of the following statements is true?

(A) Sea breeze happens during night time when the sea is cooler than the land.

(B) Sea breeze happens during day time when the land is cooler than the sea.

(C) Land breeze happens during night time when the land is cooler than the sea.

(D) Land breeze happens during day time when the sea is cooler than the land.

Question 14:

Why do people feel cool if they do not dry themselves after swimming in the sea?

(A) Water evaporates and causes cooling.

(B) Water insulates them from the warm air.

(C) Water is a good conductor of heat.

(D) Water is colder than the air.

Question 15:

Ruchika conducted an experiment to test the nature of four different samples. She noted down her observations in the given table.

Ruchika Conducted an Experiment to Test the Nature of Four Different Samples. She Noted down Her Observations in the Given Table
SampleEffect on
Turmeric SolutionChina rose indicatorMethyl orange indicator
PYellowDark PinkRed
QRedGreenYellow
RYellowDark PinkRed
SYellowLight PinkOrange

Which of the following conclusions can be drawn from this experiment?

(A) P and R are basic; Q is acidic, and S is neutral in nature.

(B) P is acidic, Q is basic, R and S are neutral in nature.

(C) P and R are acidic; Q is basic, and S is neutral in nature.

(D) P is neutral, Q and R are basic, and S is acidic in

Question 16:

Which of the following are chemical changes?

I.

II.

III.

IV.

(V)

(A) I, III and V only

(B) III, IV and V only

(C) II and IV only

(D) All of these

Question 17:

Landowner of a village has decided to use one of his fields which had factories for several years for the production of crops. With which of the following substances does he need to treat his field for a long time to fulfil his purpose?

(A) Organic matter

(B) Quick lime

(C) Slaked lime

(D) Both B and C

Question 18:

Which of the following statements is/are incorrect?

I. Stainless steel does not rust.

II. Breaking down of ozone layer is a physical change.

III. Large crystals of pure copper sulphate are formed from its solution by the process called galvanisation.

IV. Photosynthesis and digestion are chemical changes.

(A) I, II and IV only

(B) II and III only

(C) III only

(D) None of these

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