Class 7 Science Chapter 9 Practice Question Answers - Motion and Time

Q1. The speed of a car is 40 km/h. What is time taken to reach from one city to another city if the distance between the two cities is 480 km:
(a) 10 hours
(b) 11 hours
(c) 14 hours
(d) 12 hours
Ans: (d)
The time is taken by a car is 12 hours.

Q2. 72 km/h m/s:
(a) 72 m/s
(b) 20 m/s
(c) 36 m/s
(d) 12 m/s
Ans: (b)
72 km/h = 20m/s

Q3. The standard unit of time is:
(a) hour
(b) minute
(c) second
(d) all of these
Ans: (c)
The standard unit of time is second.

Q4. The clock used now a days are:
(a) quartz
(b) minute
(c) second
(d) all of these
Ans: (a)
The quartz clock is used now-a-days.

Q5. When weight of bob in a pendulum is increased then the oscillation period of a pendulum is:
(a) increased
(b) decreased
(c) no change
(d) can’t say
Ans: (b)
When weight of bob in pendulum is increased, the oscillation period of pendulum is decreased.

Q6. The standard unit of length is:
(a) metre (‘m’)
(b) kilometre
(c) m/s
(d) km/h
Ans: (a)
The standard unit of length is meter (‘m’).

Q7. The standard unit of mass is:
(a) ‘kg’
(b) mg
(c) g
(d) none of these
Ans: (a)

(‘Kg’) is the unit of mass.

Q8. The standard unit of temperature is:
(a) ‘Kg’
(b) F
(c) °C
(d) can’t say
Ans: (a)
(‘K’) is the unit of temperature.

Q9. Distance:
(a) D = S x T
(b) D = T x S
(c) D = T/S
(d) D = S/T
Ans: (a)
D = S x T

Q10. Time:
(a) t = d x s
(b) t = s x d
(c) t = d/s
(d) t = 0
Ans: (c)
D = S x t
t = D/S

Q11. The distance moved by the object in a unit time is:
(a) time
(b) distance
(c) speed
(d) can’t say
Ans: (c)
The distance moved by the object in a unit time is speed.

Q12. The pictorial representation of two variables inter dependent of one another is known as:
(a) motion
(b) graph
(c) speed
(d) time
Ans: (b)
Graph is pictorial representation of two objects.

Q13. If an object covers equal distance in equal intervals of time, then the object is said to have:
(a) non-uniform motion
(b) uniform motion
(c) oscillation
(d) none of these
Ans: (b)
A staight line covers equal distance in equal intervals of time is uniform motion.

Q14. A device used to measure the speed of vehicles is:
(a) odometer
(b) graph
(c) speedometer
(d) none of these
Ans: (c)
Speedometer measure the speed of vehicles.

Q15. The to and fro motion of the particle about its mean position is called:
(a) intervals
(b) vibration
(c) pendulum
(d) can’t say
Ans: (b)
To and fro motion is vibration.

Q16. The most common example of periodic motion or oscillatory motion is:
(a) interval
(b) pendulum
(c) simple pendulum
(d) speedometer
Ans: (c)
Simple pendulum is periodic or oscillatory motion.

Q17. The time interval between one sunrise and next sunrise is called a:
(a) year
(b) month
(c) day
(d) week
Ans: (c)
The time interval between one sunrise to next sunrise is a day.

Q18. Which of the following motion is circular motion:
(a) motion of a child over see saw
(b) motion of a car running on a straight road
(c) motion of an electric bell hammer
(d) motion of a child in a merry go round
Ans: (d)
A child in a merry-go-round is circular motion.

Q19. A simple pendulum takes 32 S complete 20 oscillations. What is the time period of pendulum:
(a) 640
(b) 0.625
(c) 1.60
(d) none of these
Ans: (b)
The time period of pendulum is 0.625.

Q20. Distance between two cities is measured in:
(a) metres
(b) kilometres
(c) second
(d) kilogram
Ans: (b)
Distance between two cities is measrued by kilometers.

Q21. Motion of a train on a straight
(a) oscillatory motion
(b) circular motion
(c) uniform motion
(d) straight line motion
Ans: (d)
A train on a straight bridge is straight line motion.

Q22. A device used to measure the distance moved by a vehicle:
(a) odometer
(b) speedometer
(c) both
(d) none of these
Ans: (a)
An odometer measured the distance moved by a vehicle.

Q23. The time taken by the earth to make one revolution around the sun is called a:
(a) day
(b) week
(c) month
(d) year
Ans: (d)
The earth make one revolution around the sun in a year.

Q24. The motion of a vibrating particle from one extreme position to another extreme position about its mean position is:
(a) speed
(b) circulation
(c) oscillation
(d) none of these
Ans: (c)
The motion of vibrating particle is circulation.

Q25. The time taken by a vibrating body to complete one vibration is:
(a) speed
(b) time of period
(c) distance
(d) all of these
Ans: (b)
The time taken by a vibrating body to complete one vibration is time period.

Q26. A horse pulling a cart has:
(a) oscillatory motion
(b) circular motion
(c) linear motion
(d) none of these
Ans: (a)
A horse pulling a cart has oscillatory motions.

Q27. If the speed of a body moving in a straight line changes then the speed of the body is:
(a) uniform
(b) non-uniform
(c) some times uniform and non-uniform
(d) none of these
Ans: (b)
If the speed of a body moving in a straight line changes then the speed of the body is nonuniform.

Q28. An earth completes one revolution around the sun in:
(a) 1 day
(b) 1 year
(c) 1 hour
(d) none of these
Ans: (b)
An earth complete one revolution around the sun in a year.

Q29. A simple pendulum is an example of:
(a) periodic motion
(b) circular motion
(c) linear motion
(d) none of these
Ans: (a)
Periodic motion is an example of a simple pendulum.

Q30. An odometer is used to measure:
(a) speed
(b) distance
(c) motion
(d) none of these
Ans: (b)
Distance is measured by an odometer