Motion and Time

When a body covers equal distance in equal interval of time, it is said to be in?

• Average speed

• Non-uniform motion.

• Uniform motion

• Speed.

A car covers 40 km in the first hour, 115 km in the next two hours, and 45km in the next one hour. What is the average speed of the car?

• 40 km/h

• 50 km/h

• 100 km/h

• 800 km/h

A person starts riding at 9:00 am to reach a location X which is about 175 km away from the starting point. He drives at an average speed of 70 km/hr. When is the person likely to reach the destination?

• 10:00 am

• 10:30 am

• 11:00 am

• 11:30 am

The school organised an educational tour for the students. They arranged a bus scheduled to leave for the trip at around 8:00 am. The odometer reading of the bus at the start and end of the trip is provided on the table. What was the average speed of the bus during the trip?

• 30 km/h

• 70 km/h

• 90 km/h

• 210 km/h

A student wants to measure the speed of a ball rolling down a ramp. He found a few instruments which are listed in the table. Which of these are required to measure the speed of the ball?

• Hourglass and thermometer

• Balance scale and stopwatch

• Measuring tape and stopwatch

• Measuring tape and thermometer

A simple pendulum takes 55s to complete 50 oscillations. What is the time-period of this pendulum?

• 3.2 s

• 2.1 s

• 1.1 s

• 0.9 s

Oscillations are set in a simple pendulum whose length is 2m and the mass of the bob is 2kg. Its time period

• is always constant

• increases slowly

• Decreases slowly

• First increases and then decreases.

Which of the following cannot be obtained from a given distance-time graph of a moving object?

• Speed of the object.

• Time taken by the object.

• Change in position of the object.

• Change in weight of the object

Convert 72 km/h into m/s.

• 72 m/s

• 20m/s

• 36 m/s.

• 12 m/s.

Choose the correct option.

• i-c; ii- b ; iii –a

• i-a; ii –b ; iii –c

• i- b; ii – c; iii – a

• i- b; ii – a; iii- c