Question

4. Which of these is not a unit of time?
(a) hour
(b) minute
(c) second
(d) metre/second
5. Which of the following is not a unit of speed
(a) km/h
(b) cm/s
(c) m/s
(d) h/km
6. The SI unit of speed is
(a) km/h
(b) cm/s
(c) m/min
(d) m/s
7. The time period of a pendulum depends upon
its
(a) length
(b) breadth
(c) height
(d) none of these​

Answer 1

Explanation:

We know that,

(i) The basic unit of time is second, second is the SI unit of time.

(ii) Every object may or may not moves with a constant speed. Some are accelerating also.

(iii) The Distance between two cities are measured in kilometers. it is big unit of distance.

(iv) The time period of a given pendulum is always constant because it depends on the length of the pendulum.

(v) The speed of a train is measured in km/h and in m/s.

So, we can say that, (ii), (iv) and (v) are not correct statements.

Hence, This is the correct answer.

Answer 2

Answer:

4. second

5.h/km

6. m/s and km/h

7. length