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Q1. The base/fundamental unit of time is

• minutes
• second
• hour
• year

Solution

The base/fundamental unit of time is a second.

Q2. The meter that measures the distance moved by the vehicle is known as

• odometer
• speedometer
• thermometer
• none of the above

Solution

The meter that measures the distance moved by the vehicle is known as odometer.

Q3. Which part of a second is called nano second?

• One hundredth
• One thousandth
• One millionth
• One billionth

Solution

A nanosecond is one billionth of a second.

Q4. Which of the following is not an example of to and fro motion?

• Motion of a simple pendulum
• Motion of a liquid in U-tube
• Motion of a swing
• Motion of earth around the sun

Solution

Motion of earth around the sun

Q5. Which of the following is not used for measuring time?

• Sundial
• Water clock
• Sand clock
• Hand span

Solution

Hand span is not used for measuring time.

Q6. A bus moves with a speed of 40 km/h and covers a distance of 10 km. What is the total time taken by the bus during the whole journey?

• 1/2 hour
• 2/3 hour
• 1/4 hour
• 1 hour

Solution

Time taken = distance covered / speed                  = 10/40                  = 0.25 h or 1/4 hour

Q7. Who found that a pendulum of a given length takes always the same time to complete one oscillation?

• Galileo Galilie
• Newton
• Albert Einstein
• Archimedes

Solution

Galileo Galilie (A.D. 1564 - 1642) found that a pendulum of a given length takes always the same time to complete one oscillation.

Q8. How many seconds are there in one day?

• 86000 seconds
• 86400 seconds
• 36000 seconds
• 90000 seconds

Solution

 1 day = 24 hours          = 24 x 60 minutes          = 24 x 60 x 60 seconds          = 86400 seconds

Q9. How many second make 3 minutes?

• 150 seconds
• 120 seconds
• 180 seconds
• 300 seconds

Solution

1 minute = 60 secondsTherefore, 3 minutes = 3 x 60 seconds                              = 180 seconds

Q10. If the distance-time graph is a straight line parallel to time axis, it indicates that the object is

• not moving
• moving
• moving with an increasing speed
• moving with a decreasing speed

Solution

If the distance-time graph is a straight line parallel to time axis, it indicates that the object is not moving.

Q11. The  clocks or watches which have an electric circuit with one or more cells are called

• quartz clocks
• sundial
• water clocks
• sand clocks

Solution

The  clocks or watches which have an electric circuit with one or more cells are called quartz clocks.

Q12. Which of these is not a unit of speed?

• metre/second
• kilometre/hour
•  second/metre
• metre/hour

Solution

Unit of speed contains any unit of length/unit of time. It can't be unit of time/unit of length.

Q13. An object is said to have a uniform motion if it moves

• In one way only along a straight line path
• At a constant speed in one way only, along a straight line path.
• At a constant speed
• Uniformly along a circular path.

Solution

Uniform motion refers to motion at a constant speed in one way only, along a straight line path.

Q14. Which out of the following is the biggest unit of measuring time?

• Second
• Year
• Day
• Hour

Solution

A year is the biggest unit to measure time.

Q15. Rate of distance travelled with time is termed as :

•  Speed
• Velocity
• Acceleration
• Displacement

Solution

Speed of a body is the rate of distance travelled with time.

Q16. The speed of an object is defined as

• The distance traveled by the object multiplied by the time taken
• The distance traveled by the object
• The time taken
• The distance traveled by the object divide by the time taken

Solution

Speed = Distance Travelled/Time taken.

Q17. To measure time, we can use

• Only the regularity of the oscillations of a quartz crystal.
• Only the regularity of the earth's rotation about its own axis.
• Only the periodic oscillation of a pendulum.
• All of the above.

Solution

Any oscillation or periodic motion can be used to measure time.

Q18. The to and fro motion of a simple pendulum is an example of a

• Linear motion
• Circular motion
• Oscillatory motion
• All of the above

Solution

The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory motion.

Q19. Average speed = _______

• Half distance travelled / time
•  Half distance travelled x time
•  Total distance travelled / total time
• Total distance travelled x total time

Solution

Average speed = Total distance travelled / total time

Q20. A pendulum takes 10 sec to complete 5 oscillations. What is the time period of the pendulum?

• 1 seconds
• 2 seconds
• 1.5 seconds
• 2.5 seconds

Solution

Time Period = Time taken to complete one oscillationTherefore, T = Total time taken / Total oscillations                   = 10/5                  = 2 seconds

Q21. Time taken by a pendulum to complete one oscillation is known as

• Time interval
• Time period
• Time gap
• Pendulum time

Solution

Time taken by a pendulum to complete one oscillation is known as time period.

Q22. A bike moves with a speed of 50 km/h for 30 minutes and then with a speed of 60 km/h for the next 30 minutes. The total distance covered by the bike is

• 40 km
• 55 km
• 45 km
• 50 km

Solution

Dist. = Speed x Time        = (50 x 0.5) + (60 x .5)       = 25 + 30       = 55 km.

Q23. On which axis, dependent variables are represented?

• x-axis
• y-axis
• at origin
• none of the above

Solution

Dependent variables are represented on y-axis.

Q24. When the bob of the pendulum is released after taking it slightly to one side, it:

• becomes still and does not move
• begins to move to and fro
• comes to rest at the mean position
• begins to move up and down.

Solution

When the bob of the pendulum is released after taking it slightly to one side, it begins to move to and fro.

Q25. A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15 minutes. The total distance covered by the car is:

• 100 km
• 25 km
• 15 km
• 10 km

Solution

Q26. Which of the following relations is correct?

• Speed = Distance x Time
• Speed = Distance / Time
• Speed = Time/ Distance
• Speed = 1/Distance x Time

Solution

Speed is given by the amount of distance covered divided by the time taken.

Q27. If the speed of an object moving along a straight line keeps changing, its motion is said to be

• uniform motion
• non-uniform motion
• circular motion
• periodic motion

Solution

If the speed of an object moving along a straight line keeps changing, its motion is said to be non-uniform motion.

Q28. Which speed do we take into consideration while measuring time taken to cover a particular distance?

• Average speed
• Initial speed
• Final speed
• Sum of initial and final speed

Solution

It is quite unlikely for a body to keep moving at a uniform speed over a large time interval. Therefore we take average speed of the body to measure time taken.

Q29. The ages of stars and planet are often expressed in:

• millions of years
• billions of years
• hundreds of years
• thousands of years

Solution

The ages of stars and planet are often expressed in billions of years.

Q30. Time period of a simple pendulum depends upon:

• None of the above
• Both of the above
• Weight of bob
• Length of the pendulum

Solution

Time period of a simple pendulum depends upon the length of the pendulum.

Q31. 1 hour is equal to how many seconds?

• 360 seconds
• 3600 seconds
• 36000 seconds
• 720 seconds

Solution

1 hour = 60 minutes          =  60 x 60 seconds          =  3600 seconds

Q32. Which of the following is the S.I. unit of time?

• Hour
• Minute
• Day
• Second

Solution

The S.I. unit of time is second.

Q33. Which one of the following is written at one corner of speedometer?

•  km/h
• km h
• m s
• s/m

Solution

As speedometer measures speed of a vehicle thus km/h is written at one corner of it.

Q34. Out of the animals - horse, hound, tortoise and cat - the fastest and the slowest are

• horse and tortoise, respectively
•  horse and cat, respectively
• hound and cat, respectively.
• hound and tortoise, respectively

Solution

The fastest and the slowest are horse and tortoise, respectively.

Q35. Which of the following statements is correct about distance-time graphs?

• We can find the distance moved by a body at any instant of time
• The graph shows that motion is uniform or non-uniform
• The graph tells that motion is accelerated or retarded
• All of the above

Solution

All of the above

Q36. The time between one new moon to the next is called?

• A day
• A week
• A month
• A year

Solution

The time between one new moon to the next is called a month.

Q37. 1 hour 30 minutes is equal to how many seconds?

• 360 seconds
• 3600 seconds
• 5400 seconds
• 720 seconds

Solution

1 hour = 60 minutes          =  60 x 60 seconds          =  3600 seconds30 minutes = 30 x 60 seconds = 1800 secondsTherefore, 1 hour 30 minute = 3600 + 1800 = 5400 seconds.

Q38. One of the most well-known periodic motions is that

• of sea waves
• of a car
• of a simple pendulum
• all of the above

Solution

One of the most well-known periodic motions is that of a simple pendulum.

Q39. The distance-time graph is an example of ________ graph.

• bar
• pie
• line
• none of the above

Solution

The distance-time graph is an example of line graph.

Q40. A bus moves with a speed of 40 km/h and covers a distance of 20 km. What is the total time taken by the bus during the whole journey?

•  1/2 hour
• 2/3 hour
• 1/4 hour
• 1 hour

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