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WorksheetsClass 7 Revision chemical change, forest, motion
Total questions: 20
Worksheet time: 10mins
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
what is the canopy layer?
The Uppermost branches and leaves of tall trees act like a roof or umbrella over the smaller trees in the forest, called the canopy layer.
The Uppermost branches and leaves of tall trees which don't act like a roof or umbrella over the smaller trees in the forest is called the canopy layer.
the layer of vegetation in a forest just below the canopy is understorey.
The distance-time graph of vehicle moving with constant speed is a ________ line
Curved
horizontal
straight
parallel
The to and fro motion of a simple pendulum is an example of _________ motion.
Rectilinear
curvilinear
circular
oscillatory
A simple pendulum takes 32 seconds to complete 20 oscillations. The time period of this pendulum is:
12 seconds
1.6 seconds
1.8 seconds
52 seconds
Is this an example of a physical or chemical change?
physical
chemical
When a candle burns, both physical and chemical changes occurs.
True
False
A white tablet is dropped into water. The water becomes cloudy and bubbles are produced. What type of change has occurred?
Physical change
Chemical change
No change
