EASY
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Choose the device used for measuring time.

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Important Questions on Motion and Time

MEDIUM
Science>Physics>Motion and Time>Time
Two guns were fired from the same place at an interval of 10 minutes and 30 seconds, but a person in the train approaching the place hears the second shot 10 minutes after the first. The speed of the train (in km/hr), supposing that speed travels at 330 metres per second is:
HARD
Science>Physics>Motion and Time>Time
A fort had provision of food for 150 men for 45 days. After 10 days, 25 men left the fort. The number of days for which the remaining food will last, is:
EASY
Science>Physics>Motion and Time>Time
What units do we use to measure time?
MEDIUM
Science>Physics>Motion and Time>Time
Give an example of a periodic change related to the earth that can be used to measure time.
 
HARD
Science>Physics>Motion and Time>Time
A train X starts from Meerut at 4 p.m. and reaches Ghaziabad at 5 p.m. while another train Y starts from Ghaziabad at 4 p.m. and reaches Meerut at 5.30 p.m. the two trains will cross each other at:
EASY
Science>Physics>Motion and Time>Time
The duration elapsed between one event and the next is called by this name.
MEDIUM
Science>Physics>Motion and Time>Time
The jogging track in a sports complex is 726 metres in circumference. Deepak and his wife start from the same point and walk in opposite directions at 4.5 km/hr and 3.75 km/hr respectively. They will meet for the first time in:
EASY
Science>Physics>Motion and Time>Time
Annu wants to measure the time interval of an activity in science laboratory. Help her to choose the best instrument. Explain the reason for the same.
HARD
Science>Physics>Motion and Time>Time
An express train travelled at an average speed of 100 km/hr, stopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point?
EASY
Science>Physics>Motion and Time>Time

Name the following.

Three kinds of clocks used a long time ago.

EASY
Science>Physics>Motion and Time>Time
Why do you think accurate measurements of time became possible much after accurate measurement of length and mass?
MEDIUM
Science>Physics>Motion and Time>Time
A person drove a certain distance by car at the speed of 35 km/h and returned on cycle at the speed of 10 km/h, If the whole journey took 18 hours. Then what distance did he drive on car?
EASY
Science>Physics>Motion and Time>Time
Why do we need to measure time? Name the types of devices used to measure time from ancient times to present time. Which one of them gives the most accurate time? 
MEDIUM
Science>Physics>Motion and Time>Time
On what principle are modern electronic watches based?
 
EASY
Science>Physics>Motion and Time>Time
Discuss how man started measuring time.
EASY
Science>Physics>Motion and Time>Time
For an accurate measurement of time in sports, we use a _____.
MEDIUM
Science>Physics>Motion and Time>Time
The distance between the Earth and the Sun is 14,90,00,000 km. The speed of light is 3×108 m/s. The sun stops giving out light now, how much longer will we be able to see the Sun?
EASY
Science>Physics>Motion and Time>Time

Name the principle on which the following instruments work: Sundial

EASY
Science>Physics>Motion and Time>Time
We use a clock to measure the accurate time interval of a sports event.
HARD
Science>Physics>Motion and Time>Time
A man crosses a square diagonally at the speed of 3 km/hr in 2 minutes. What is the area of the field?