NSO Level 2 Class 7 Science Paper 2012 - 13 Higher Questions and Answers Part 1

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Question 16:

Beena obtains a blurred image of an object on a screen by using a concave mirror. In order to obtain a sharp image on the screen, she will have to shift the mirror ________.

(A) Towards the screen

(B) Away from the screen

(C) Either towards or away from the screen depending upon the position of the object

(D) To a position very far away from the screen

Question 17:

A bus is moving on a straight road. The speed time graph for the motion of the bus is shown in figure. Find the distance travelled by the bus in 4 seconds.

Illustration: NSO Level 2 Class 7 Science Paper 2012 - 13 Higher Questions and Answers Part 1

(A)

(B)

(C)

(D)

Question 18:

Low atmospheric pressure exists on the earth in which of the following latitudes?

(A) At the equator only

(B) At and

(C) At the poles

(D) At the equator and at

Question 19:

A metal rod is shaped into a ring with a small gap. If this is heated, which of the following will not occur?

(A) The length of the rod will increase.

(B) The gap will decrease.

(C) The gap will increase.

(D) The diameter of the ring will increase in the same ratio as the length of the rod.

Question 20

Which one of the following statements is false?

(A) The electric current leaving the positive terminal of a battery is the same as the current returning to the negative terminal.

(B) A battery supplies the same current to any object to which it is connected.

(C) A conductor in which an electric current is flowing has an electric field in its interior.

(D) The electric current flows in a direction opposite to the motion of the electrons.

Question 21:

Read the following statements and mark the correct option.

Statement 1: On the earth, summer occurs when the earth is closest to the sun and winter occurs, when the earth is farthest from the sun.

Statement 2: The earth is a satellite of the sun.

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

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

(C) Statement 1 is correct but statement 2 is incorrect.

(D) Both statements 1 and 2 are incorrect.

Question 22:

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 23:

A truck takes 20 s to travel the first 80 m, and another 10 s to travel a further 70 m. What is the average speed of the truck?

(A)

(B)

(C)

(D)

Question 24:

Four identical light bulbs are shown in figure. What happens if bulb A fails, so that it cannot conduct?

Illustration: NSO Level 2 Class 7 Science Paper 2012 - 13 Higher Questions and Answers Part 1

(A) Both bulbs B and D will glow.

(B) Only bulb C will glow.

(C) Only bulb D will glow.

(D) Both bulbs C and D will glow.

Question 25:

When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by________.

(A) The cart on the horse

(B) The ground on the horse

(C) The ground on the cart

(D) The horse on the ground

Question 26:

Niranjan collected soil samples from two different fields-1 and 2 which have poor fertility. He collected the following information about the two fields.

  • Excessive use of chemical fertilizers in field 1.
  • Soil solution of field-2 turns color of phenolphthalein to pink.

Suggest the soil treatment of the two fields for better crop yield.

(A) Slaked lime for both the fields

(B) Organic matter for both fields

(C) Slaked lime for field-1 and organic matter for field-2

(D) Organic matter for field-1 and slaked lime for field-2