Class 7 Revision chemical change, forest, motion

The slope of a distance-time graph of a moving object indicates:

• distance moved by the object

• time taken by the object

• speed of the object

• position of the object

A bus takes 30 minutes to travel a distance of 25 kilometers. The speed of the bus in km/h is :

• 55 km/h

• 50 km/h

• 5 km/h

• 75 km/min

Speedometer measures distance

• True

• False

The lowest layer in the understorey is formed by

• SHRUBS

• HERBS

• TREES

• TALL GRASSES

Which of these is not obtained from a forest product?

• a) paper

• (b) furniture

• (c) plastics

• (d) medicines

The instrument installed in a car for measuring the distance travelled by the car is called:

• barometer

• speedometer

• anemometer

• odometer

The distance moved by an object in a unit time is called

• Distance

• Displacement

• Time

• Speed

Understoreys are formed due to

• Different sizes of the crown

• Different types of the crown

• Different height of the trees.

• All of these

The time taken by the pendulum to complete one oscillation is called its

• duration

• displacement

• time interval

• time - period

Name different layers of a forest in order.

• canpye layer,undrestorey layer,forest floor

• canopy layer, understorey and forest floor

• conapy layer,forestfloor and understorye