HEAT AND MOTION AND TIME grade 7

In Which Of The Statement Is Or Are Correct About “Thermometer”?

• Don’t hold the thermometer by the bulb

• Don’t washed thermometer by any liquid

• Don’t jerks the thermometer before use

• Don’t use clinical thermometer for the person who works in sunlight

In Which Of The Following Statement Is Or Are Incorrect?

• Heat is a form of energy.

• Heat flows from one object to another object when there is a difference in temperature.

• In the transmission of heat total amount of heat remains unchanged.

• None of the above

Stainless Steel Pans Are Usually Provided With Copper Bottoms. The Reason For This Could Be

• Copper is a better conductor of heat than the stainless steel

• Such pans appear colorful

• Copper bottom makes the pan more durable

• Copper is easier to clean than the stainless steel

One Litre Of Water At 30 Degree Celsius Is Mixed With One Litre Of Water At 50 Degree Celsius. The Temperature Of The Mixture Will Be

• 80 degree Celsius

• More than 50 degree Celsius but less than 80 degree Celsius

• 20 degree Celsius

• Between 30 degree Celsius and 50 degree Celsius

Rita Has Three Thermometers. She Wants To Measure The Temperature Of Her Body And That Of Boiling Water. Which Thermometer(S) Should She Choose?

• Clinical thermometer for measuring body temperature and laboratory thermometer for measuring the temperature of boiling water

• Clinical thermometer for measuring temperature of both.

• Laboratory thermometer for measuring temperature of both.

• Digital thermometer for measuring temperature of both.

A bus travels 54 km in 90 minutes. The speed of the bus is

• 0.6 m/s

• 10 m/s

• 5.4 m/s

• 3.6 m/s

Nearly all the clocks make use of

• rectilinear motion

• periodic motion

• random motion

• circular motion

Ram walks to his school which is at a distance of 3 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back by a bicycle with his friend and reaches home in 20 minutes. His average speed in km/h is

• 8.3

• 7.2

• 5

• 3.6

If a body covers equal distances in equal interval of time, the body is said to be in..........

• Uniform motion

• Non uniform motion

• Stationary

• None of these

Which of the following examples is related to rectilinear motion?

• Movement of Earth around the sun

• A car moving on a straight road

• Motion of the hands of a clock

• The needle in a sewing machine