Match the following columns. Column A Column B a. SI unit of time i. Length, mass, time b. Rotational motion ii. Small unit of measuring length c. Three fundamental physical quantities. iii. Straight line motion d. A length which is 1 1000 th part of a metre iv. Improper unit of measurement e. Handspan v. 10 km f. A length equal to 10 , 000 m vi. Motion about an axis g. Rectilinear motion vii. millimetre h. Millimetre viii. second

a. SI unit of time - viii. second The SI unit of time is second. 60 seconds constitute one minute . b. Rotational motion - vi. motion about an axis When a moving object move about a fixed point or axis of rotation, it is said to have rotational motion. During a rotational motion, the distance of any point from the centre of the object remains the same. c. Three fundamental physical quantities - i. length, mass, time Three fundamental physical quantities are length, mass and time. Mass is the amount of matter present in an object. d. A length which is 1 1000 th part of a metre - vii. millimetre A length which is 1 1000 th part of a metre is millimetre. 1 centimetre is equal to 10 millimetres . e. Hand span - iv. improper unit of measurement Hand span is the distance between the tip of the thumb and the tip of the little finger of a fully stretched hand. Hand span is an improper unit of measurement, as the length of the body parts vary from person to person. f. length equal to 10 , 000 m - v. 10 km Length is the distance between any two points or places. The SI unit of length is metre. 1 kilometre is equal to 1000 metres . The length equal to 10 , 000 m is 10 km . g. Rectilinear motion - iii. straight-line motion An object is said to be in linear or rectilinear motion, if it moves from one position to another along a straight line in one direction only. h. Millimetre - ii. small unit of measuring length Millimetre is a small unit of measuring length. The thickness of a thin wire is expressed in millimetres. 1 decimetre is equal to 100 millimetres . Column A Column B a. SI unit of time viii. second b. Rotational motion vi. motion about an axis c. Three fundamental physical quantities. i. length, mass, time d. A length which is 1 1000 th part of a metre vii. millimetre e. Handspan iv. improper unit of measurement f. A length equal to 10 , 000 m v. 10 km g. Rectilinear motion iii. straight line motion vii. millimetre h. Millimetre ii. Small unit of measuring length

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The metallic ball in a simple pendulum is called the (bob/armature).

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Important Questions on Motion and Time

EASY

Science>Physics>Motion and Time>Measurement of Time

If Shivan walks at the rate of

19 kmph

. How much time (in

\min

) will he take to cover

665 m

HARD

Science>Physics>Motion and Time>Measurement of Time

A man is walking at a speed of

12 km / hour

. After every kilometer he takes rest for

4 minutes

. How much time (in minutes) will he take to cover a distance of

8 kilometers

EASY

Science>Physics>Motion and Time>Measurement of Time

Walking at

{(\frac{4}{5})}^{th}

of his usual speed, a man is

12 minutes

late for his office. What is the usual time taken by him to cover that distance?

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

At what time $70^{o}$ angle form in between $2$ and $3$ ?

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

A and B are at a distance of

1.7 km

apart and they start running towards each other at a speed of

8 m / s

and

9 m / s

respectively. After how much time, will they meet each other?

EASY

Science>Physics>Motion and Time>Measurement of Time

A takes

2 hours 30 minutes

more than B to walk

40 km

. If A doubles his speed, then he can make it in

1 hour

less than B. How much time (in

hours

) does A require for walking a

40 km

distance?

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

A train leaves station

A

8 am

and reaches station

B

12 noon

A

car leaves station

B

8 : 30 am

and reaches station

A

at the same time when the train reaches station

B

. At what time do they meet?

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

A boy increases his speed to

\frac{9}{5}

times of his original speed. By this he reaches his school

30 minutes

before the usual time. How much time he takes usually?

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

Walking at

60 %

of his usual speed, a man reaches his destination

1 hour 40 minutes

late. His usual time (in

hours

) to reach the destination is:

EASY

Science>Physics>Motion and Time>Measurement of Time

What will be the angle between minute and second hands at 2:12 pm.

EASY

Science>Physics>Motion and Time>Measurement of Time

What is an oscillatory motion? Give examples.

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

The bob of a simple pendulum takes

0.3 s

to go from one extreme position to the mean position. What is the time period?

EASY

Science>Physics>Motion and Time>Measurement of Time

Look at the diagram of a simple pendulum. The bob of the pendulum is released at point 'X'. The period of the oscillation is found to be $0.25 s$ .

Question Image

Calculate how long it takes for the bob of the pendulum to swing from X to Y.

EASY

Science>Physics>Motion and Time>Measurement of 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.

EASY

Science>Physics>Motion and Time>Measurement of Time

We use a clock to measure the accurate time interval of a sports event.

MEDIUM

Science>Physics>Motion and Time>Measurement of Time

Match the following columns.

Column A	Column B
a. SI unit of time	i. Length, mass, time
b. Rotational motion	ii. Small unit of measuring length
c. Three fundamental physical quantities.	iii. Straight line motion
d. A length which is ${\frac{1}{1000}}^{th}$ part of a metre	iv. Improper unit of measurement
e. Handspan	v. $10 km$
f. A length equal to $10, 000 m$	vi. Motion about an axis
g. Rectilinear motion	vii. millimetre
h. Millimetre	viii. second