CBSE Sample Paper 2021 Class 7 Science Annual Examination
Time: 2:30 hour/M.M.-80
All questions are compulsory.
1- Tick the correct option.(5)
i) One solar day is equal to
a- 24 hour
b- 1440 min
c- 86400 sec
ii) The standard unit of speed is
iii) Which of the following does not allow the electric current to pass through them?
iv) The rear view and side view glasses in cars are made of
a- Concave mirror
b- concave lens
c- convex mirror
v) Tornadoes are also called
vi) The percentage of water present in human body
vii) Which of the following is not a forest product?
viii) Which one is a carnivore?
ix) Increased growth of algae occurs due to the presence of
x) Which one is a conductor of electricity?
2- State true or false statement. (5)
i) Fuse wire has a low electric resistance.
ii) Fuse wire melts when the circuit is overloaded.
iii) Winds blow from land to ocean in winter.
iv) An increase in pressure indicates the possibility of a steam.
v) Decomposers are producers.
vi) Forest brings about global warming.
vii) Bacteria and fungi are decomposers.
viii) Rabbit is an herbivore animal.
ix) Dried sludge can be used as manure.
x) Stagnant water does not lead to any disease.
3- Fill in the blanks. (5)
i) Forests occupy about __________ of the world’s total land area.
ii) Seawater is __________in taste.
iii) Groundwater is obtained with the help of______ and_______.
iv) Moving air is called__________.
v) Air pressure __________when wind speed increases.
vi) An anemometer measures__________.
vii) The torch makes use of __________ for reflector.
viii) A fuse wire has __________ electric resistance.
ix) The time gap between two events is called __________.
4- Match correctly.(7)
i) One second saline water
ii) Fuse a unit of time
iii) Green wire safety device
iv) Ocean water earth wire
v) Water table cholera
vi) Waste water upper level of groundwater
vii) Water borne disease used water
5- Define the following.(8)
ii) food chain
6- Differentiate between the following. (Do any 2)(4)
i) Thunderstorm and cyclones
ii) Real image and virtual image
iii) Convex lens and concave lens
7- Answer the following questions in brief.(any 8) (16)
i) Define oscillation and time period of a pendulum.
ii) What are the causes of fire in electric circuit?
iii) Why a concave lens is called a diverging lens?
iv) How is wind produced?
v) What are the three states of water?
vi) What are the different sources of water?
vii) List five products we get from forests?
viii) What are understoreysin a forests?
ix) How plants are dependent on animal?
8- Answer the following questions in detail.(Do any 5)(20)
i) What are conductors? How are they useful in an electric circuit?
ii) Why is sea and ocean water unfit for human consumption?
iii) In which all ways is water important to us?
iv) How can we conserve forests?
v) A bus takes 2 hours to cover a distance of 80km calculate its speed in km/h and m/s.
vi) How do forests help in maintaining the balance between oxygen and carbon Di oxide in atmosphere?
vii) List the different ways in which forests are useful to us.
9- Draw labelled diagram of any two of the following. (10)
i) Water cycle
ii) electric bulb
iii) rainwater harvesting