Learn Science Motion and Time , Class 7 Science Motion and Time Exercise, Free Online Motion and Time Lessons

Class 7 Science Study Material

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Motion and Time

Oscillatory motion is also known as

a) Rectilinear motion.
b) Circular motion.
c) Non-uniform motion.
d) Periodic motion.

✔Answer

✔Solution

Correct Answer Is : Periodic motion.

Solution Is : Oscillatory motion can be defined as the periodic motion of a body about its position of rest or the to and fro motion that a body repeats about its position of rest after a fixed interval of time.

In a uniform motion,

a) Average speed is more than actual speed.
b) The object is moving along circular track.
c) The object is moving with a constant speed.
d) Speed is variable.

✔Answer

✔Solution

Correct Answer Is : The object is moving with a constant speed.

Solution Is : In a uniform motion, a body covers equal distance in equal intervals of time. So, body always moves with constant speed.

If a car is moving with a speed of 45 kilometres per hour, it implies that the body

a) Covers a distance of 45 metres in one minute.
b) Covers a distance of 45 kilometres in one hour.
c) Covers a distance of 45 miles in one hour.
d) Is moving with a variable speed of 45 kilometres per hour.

✔Answer

✔Solution

Correct Answer Is : Covers a distance of 45 kilometres in one hour.

Solution Is : Speed is defined as the distance travelled by a body in a given time. If a car is moving with a speed of 45 kilometres per hour, it implies that the body covers a distance of 45 kilometres in one hour.

Periodic motion is the motion

a) Which repeats itself after a regular interval of time.
b) Which repeats itself after an
c) Which does not repeat itself.
d) Along a circular path.

✔Answer

✔Solution

Correct Answer Is : Which repeats itself after a regular interval of time.

Solution Is : The motion of an object that repeats itself after a fixed interval of time is called periodic motion.

Time intervals shorter than a day can be measured by using

a) The sun`s position.
b) The moon`s position.
c) The star`s position.
d) Clocks and watches.

✔Answer

✔Solution

Correct Answer Is : Clocks and watches.

Solution Is : Duration of a day is 24 hours. Time intervals shorter than a day can be measured by using clocks and watches as these are calibrated for 12 hours usually.

If the speed of an object moving along a straight line keeps on changing, then the

a) Motion is said to be a uniform motion.
b) Motion is said to be a non - uniform motion.
c) Object is said to be stationary.
d) Motion is said to be a fast motion.

✔Answer

✔Solution

Correct Answer Is : Motion is said to be a non - uniform motion.

Solution Is : If the speed of an object moving along a straight line keeps on changing, it means that the body covers unequal distance in equal intervals of time. Hence, the motion is said to be a non uniform motion.

A year was fixed as the time taken by the

a) Earth to complete one revolution around its axis.
b) Earth to complete one revolution around the Sun.
c) Moon to complete one revolution around the Earth.
d) Satellite to complete one revolution around the Earth.

✔Answer

✔Solution

Correct Answer Is : Earth to complete one revolution around the Sun.

Solution Is : Time taken by the Earth to complete one revolution around the Sun in its orbit is termed as a year. A year generally has a time period of 365 days, 6 hours, 9 minutes and 9.54 seconds in units of mean solar time.

The time between one new moon to the next can be called a

a) Month.
b) Year.
c) Day.
d) Interval.

✔Answer

✔Solution

Correct Answer Is : Month.

Solution Is : A month is defined as the average time between successive new or full moons, equal to 29 days, 12 hours and 44 minutes. It is also called synodic month.

The time between one sunrise and the next is known as a

a) Month.
b) Year.
c) Day.
d) Interval.

✔Answer

✔Solution

Correct Answer Is : Day.

Solution Is : The time between one sunrise and the next is known as a day or better called a solar day. It is the time taken by the Earth to complete one rotation around its axis, i.e., 24 hours.

Speed of 90 km/h when expressed in m/s is

a) 2.5
b) 25
c) 250
d) 2500

✔Answer

✔Solution

Correct Answer Is : 25

Solution Is : 1 km / hr = 5 / 18 m / s Thus,

❑Acids, Bases and Salts
❑Nutrition in Animals
❑Motion and Time
❑Light
❑Heat
❑Forests- Our Lifeline
❑Fibre to Fabric
❑Weather Climate and Adaptations of Animals to Climate
❑Water A Precious Resource
❑Waste Water Story
❑Transportation in Animals and Plants
❑Soil
❑Reproduction in Plants
❑Electric Current And Its Effects
❑Respiration in Organisms
❑Nutrients in Plants
❑Physical and Chemical Changes

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Class 7 Science Study Material

Motion and Time

Oscillatory motion is also known as

Correct Answer Is : Periodic motion.

Solution Is : Oscillatory motion can be defined as the periodic motion of a body about its position of rest or the to and fro motion that a body repeats about its position of rest after a fixed interval of time.

In a uniform motion,

Correct Answer Is : The object is moving with a constant speed.

Solution Is : In a uniform motion, a body covers equal distance in equal intervals of time. So, body always moves with constant speed.

If a car is moving with a speed of 45 kilometres per hour, it implies that the body

Correct Answer Is : Covers a distance of 45 kilometres in one hour.

Solution Is : Speed is defined as the distance travelled by a body in a given time. If a car is moving with a speed of 45 kilometres per hour, it implies that the body covers a distance of 45 kilometres in one hour.

Periodic motion is the motion

Correct Answer Is : Which repeats itself after a regular interval of time.

Solution Is : The motion of an object that repeats itself after a fixed interval of time is called periodic motion.

Time intervals shorter than a day can be measured by using

Correct Answer Is : Clocks and watches.

Solution Is : Duration of a day is 24 hours. Time intervals shorter than a day can be measured by using clocks and watches as these are calibrated for 12 hours usually.

If the speed of an object moving along a straight line keeps on changing, then the

Correct Answer Is : Motion is said to be a non - uniform motion.

Solution Is : If the speed of an object moving along a straight line keeps on changing, it means that the body covers unequal distance in equal intervals of time. Hence, the motion is said to be a non uniform motion.

A year was fixed as the time taken by the

Correct Answer Is : Earth to complete one revolution around the Sun.

Solution Is : Time taken by the Earth to complete one revolution around the Sun in its orbit is termed as a year. A year generally has a time period of 365 days, 6 hours, 9 minutes and 9.54 seconds in units of mean solar time.

The time between one new moon to the next can be called a

Correct Answer Is : Month.

Solution Is : A month is defined as the average time between successive new or full moons, equal to 29 days, 12 hours and 44 minutes. It is also called synodic month.

The time between one sunrise and the next is known as a

Correct Answer Is : Day.

Solution Is : The time between one sunrise and the next is known as a day or better called a solar day. It is the time taken by the Earth to complete one rotation around its axis, i.e., 24 hours.

Speed of 90 km/h when expressed in m/s is

Correct Answer Is : 25

Solution Is : 1 km / hr = 5 / 18 m / s Thus,

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