Measurement of Time

Q. What is an odometer?

Q. Define time

Q. How does water clock work?

Q.

The interval between two events is called

Q. What is a sundial? How does it work? [2 MARKS]

Q. What is the unit of time period of a simple pendulum?

1. metre
2. kilogram
3. second
4. kilometre

Q.

Question 1

Which of the following cannot be used for measurement of time?

(a) A leaking tap

(b) Simple pendulum

(c) Shadow of an object during the day

(d) Blinking of eyes

Q. Driving at a speed of 60 miles per hour, how long would it take to drive 240 miles?

1. 4.5 hours
2. 3.5 hours
3. 4 hours
4. 5 hours

Q.

A pendulum makes 40 oscillations in 4 seconds. Find its time period.

Q. What is a Speedometer? How does it work? [3 MARKS]

Q. Motion of tip of minute hand of a wall clock is ____________ in nature.

1. neither circular nor periodic
2. only circular
3. only periodic
4. circular as well as periodic

Q.

How can the change in the position of an object with time be represented?

Q.

Question 2

Two clocks A and B are shown in the Figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

(a) Time interval of 30 seconds can be measured by clock A

(b) Time interval of 30 seconds cannot be measured by clock B

(c) Time interval of 5 minutes can be measured by both A and B

(d) Time interval of 4 minutes 10 seconds can be measured by clock A

Q. Two clocks A and B are shown in the figure. Clock A has an hour and a minute hand, whereas clock B has an hour hand, minute hand as well as a second hand. Which of the following statement is correct for these clocks?

1. A time interval of 30 seconds can be measured by clock A
2. A time interval of 30 seconds cannot be measured by clock B
3. Time interval of 5 minutes can be measured by both A and B
4. Time interval of 4 minutes 10 seconds can be measured by clock A

Q.

Define an atomic clock?

Q.

What is the difference between speedometer and odometer?

Q. Determine the number of seconds there in a day.

Q.

which is the odd one out of these;.

Odometer, speedometer, clock

what is the

Reason:

Q.

Pendulum clock is used in sports events.

1. True
2. False

Q.

Why it is necessary to measure time?

Q.

How many minutes are there in $0.1$ hour?

Q. A train running between two stations $A$ and $B$ arrives at its destination $10$ minutes late when its speed is $50$ km/hr and $50$ minutes late when its speed is $30$ km/hr. How far is station $A$ from $B$?

1. $50$ km
2. $60$ km
   
3. $15$ km
   
4. $20$ km
   

Q. A pendulam moving to and fro periodally can be used to measure ___.

1. Length
2. Time
3. Mass
4. Temperature

Q.

Sundial is a device that measures___.

Q. A simple pendulum completes 120 oscillations in one minute. ​What is its frequency of oscillation?​

Q. Two objects move towards each other till they meet at a point. The speed of first object is $5m{s}^{-1}$ and the speed of the second object is $10m{s}^{-1}$. If the distance between the objects is $30m$ initially, what is the difference between the distances travelled by the two bodies?

1. $5m$
2. $10m$
3. $20m$
4. $30m$

Q. State the number of seconds in a day.

1. 36000 seconds
2. 86000seconds
3. 86400 seconds
4. 24000 seconds

Q. Two objects move towards each other till they meet at a point. The speed of first object is $5m{s}^{-1}$ and the speed of the second object is $10m{s}^{-1}$. If the distance between the objects is $30m$ initially, what is the difference between the distances travelled by the two bodies?

1. $10m$
2. $30m$
3. $20m$
4. $5m$

Q. A train $400$m long crosses a bridge $500$m long in $90$ sec. Find the train in km/h ?

Q. Earth takes 24 hours to complete one rotation.

1. False
2. True