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Subject :NSO    Class : Class 7

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
Given that average speed of the car is 60 km h–1.
What is the value of x?

A 120 km
B 180 km
C 240 km
D 720 km

the questions wrong, two questions are colliding

Ans 1:

Class : Class 7
The question has a bug

Ans 2:

Class : Class 7
There are 2 parts in this question which are not at all inter-related.The average speed (2nd part) question is the incomplete question of Q.10

Ans 3:

Class : Class 7

Ans 4:

Class : Class 8
How is the first part of the question related to the second part?

Ans 5:

Class : Class 7
correct options are not given

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