NSO Level 2 Class 7 Science Paper 2017 − 18 Higher Questions and Answers Part 1

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Question 1:

The velocity-time and acceleration-time graphs of a particle are given here. Its position-time graph may be given as










Question 2:

Read the given statements and select the correct option.

Statement 1: If light from a laser torch is made to fall on a prism, then a band of seven colours are not observed.

Statement 2: Laser torch gives out light of only one colour.

A. Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.

B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

C. Statement 1 is true but statement 2 is false.

D. Statement 1 is false but statement 2 is true.

Question 3:

The diagram shows two identical set-ups each consisting of a container filled with water, an electric heater, and a thermometer. Only the positions of the electric heater and the thermometer differ in both set-ups. Which of the following graphs represents the approximate variations of the readings of the thermometers, X and Y with time?










Question 4:

Which of the following statements are correct?

(i) Time period of a simple pendulum is the time taken by the pendulum to complete one oscillation.

(ii) The area under the speed-time graph on time axis is the distance.

(iii) Heat is exchanged between two bodies if they have different amount of heat but have same temperature.

(iv) In an electrical circuit, short circuit occurs when a naked live wire and a neutral wire come in direct contact.

(v) When a light wave and a sound wave travel from air into water, their speeds are decreased.

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

(B) (i) , (ii) and (iii) only

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

(D) (iii) , (iv) and (v) only

Question 5:

A point source of light S, placed at a distance L in front of the centre of a plane mirror of width d, hangs vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance from it as shown in the figure. The greatest distance over which he can see the image of the light source in the mirror is





Question 6:

The lengths of the mercury thread in a thermometer immersed in pure melting ice and in pure boiling water are and respectively. What is the temperature of a solution if the length of mercury thread is in the solution?

Lengths of the Mercury





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