Test Details

Pollution Of Air And Water, Sound and 1 other Topics

Revision test

Feb 03, 8:00 PM

20 minutes

Feb 03, 8:20 PM

60.0 marks

MCQ

30 questions

Amit Pandey

Teacher at Sant Atulanand Convent School

Class Details

Maths

Science

Social Science

English

Hindi

General Knowledge

Coaching Class 8

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Science

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Hindi

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Question Text

Question 2 :
The stars forming a group that has a recognisable shape is called a ______

Question 3 :
The radius of Jupiter is 11 times the radius of the Earth. Calculate the ratio of the volumes of Jupiter and the Earth. How many Earths can Jupiter accomodate?

Question 4 :
At night, when the sky is clear and the moon is not there, sometimes bright streaks of light in the sky can be seen. These are commonly known as_______, although they are not stars. They are called _____

Question 6 :
From space, the Earth appears ____ due to the reflection of light from water and landmass on its surface.

Question 7 :
The length of the the comet's tail grows in size as it approaches the _____.

Question 11 :
A pond contains clean water. Which of the following activities will produce least pollution of water?

Question 12 :
This chemical protects our crops and is washed into water bodies from the field-

Question 13 :
The excessive quantities of chemicals released in water acts as nutrients for the growth of which organism?

Question 15 :
The pollutants in _______ are discolouring the white marble of Taj Mahal

Question 16 :
While brushing your teeth, leaving the tap running may waste ______

Question 17 :
Lakhs of trees are planted every year in July. This event is called as-

Question 18 :
Which of the following procedures will give you water free from all impurities?

Question 20 :
Acid rain corroding the marble of the monument is called _____

Question 21 :
Which of the following voices is likely to have minimum frequency?

Question 23 :
For human ears, the audible range is 20 Hz to 20,000 Hz. State true or false.

Question 27 :
The townhall building is situated close to Boojho’s house. There is a clock on the top of the townhall building which rings the bell every hour. Boojho has noticed that the sound of the clock appears to be much clearer at night. Explain.

Question 28 :
When we strike the membrane of a 'mridangam', we hear some sound. It's the sound of

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