The City School
PECHS Junior Boys
Revision Worksheet # 2
Science Grade: 7
Q1. Choose the correct answer.
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i)
___________________ is the skill which involves transmitting and receiving
information.
a. observation
b. communication
c. inference
ii)
________________ developed vaccines to protect human beings and animals
against a number of deadly diseases.
a. Isaac Newton
b. Louis Pasteur
c. Marie Curie
iii)
The SI unit of length is _______________.
a. m
b. cm
c. km
iv)
____________ is added to an SI unit to make it smaller or larger unit.
a. unit
b. physical quantity
c. prefix
v)
______________ is the smallest division on the scale of the measuring
instrument.
a. accuracy
b. micro-metre
c. picometre
vi)
_______________ is an error in the measurement because of the incorrect
position of eye when taking reading.
a. parallax error
b. reading error
c. instrumental error
Q2. Write an appropriate unit to measure the following.
S.no
Objects to be measured
1
diameter of blood cell.
2
height of a mountain
3
size of bacterium
4
distance between two cities of Pakistan.
5
distance between earth and the sun
6
height of your school building
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Unit
Q3. Mr. Ahmed possesses following attitudes. Identify these attitudes which are
important in the learning of science.
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i)
He observes things closely and ask questions to find about it. ______________
ii)
He admits his mistake when he is wrong. _______________
iii)
He does not believe everything he reads on inter net. _____________
iv)
He does not only favour thing on the basis of his likeness. ____________
Q4. Write the proper handling of the following chemicals during an experiment
i)
chloroform: _______________________________________________
_________________________________________________________
ii)
mercury: _________________________________________________
_________________________________________________________
iii)
petrol: ___________________________________________________
_________________________________________________________
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Q5. Explain how do science and technology:
i)
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enable us to live longer and healthier.
__________________________________________________________
__________________________________________________________
__________________________________________________________
__________________________________________________________
ii)
help us to reduce damages caused by flood and earthquake.
__________________________________________________________
__________________________________________________________
__________________________________________________________
__________________________________________________________
Q6a. What do you understand by physical quantities?
/1
Ans: _________________________________________________________
_________________________________________________________
__________________________________________________________
__________________________________________________________
b) Why are quantitative observations considered more accurate in science? /1
Ans: _________________________________________________________
_________________________________________________________
__________________________________________________________
__________________________________________________________
c) Read the following statements and identify whether it is quantitative
observation or qualitative.
i) Ali is 12 cm taller than his cousins. ___________________________
ii) Ali is taller than all of his cousins. ____________________________
iii) Human heart beats 72 times a minutes. ________________________
iv) Sana’s blood pressure is high. _____________________________
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Q7. Label the parts of the Bunsen burner.
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