Subject :NSO Class : Class 4
Subject :NSO Class : Class 3
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Subject :NSO Class : Class 7
Ans 1:
Class : Class 9
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .
Ans 3:
Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.
Ans 4:
Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.
Ans 9:
Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.
Ans 10:
Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 5
Ans 3:
Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .
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Subject :NSO Class : Class 4
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Subject :NSO Class : Class 8
Ans 1:
Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly
Ans 3:
Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water
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Subject :NSO Class : Class 8
A 12 m long uniform bridge weighing 100000 N is being supported at the two ends. A lorry weighing
30000 N is parked at the 4 m mark as shown in the
figure. What are the forces acting on the bridge by
support A and support B respectively?
| Support A | Support B | |
| A | 70000 N | 60000 N |
| B | 60000 N | 70000 N |
| C | 65000 N | 65000 N |
| D | 90000 N | 40000 N |
how ?
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Subject :NSO Class : Class 3
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Subject :NSO Class : Class 6
Ans 1:
Class : Class 10
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Ans 4:
Class : Class 6
throughout the time period or the 21 swings the pendulum will pass through the point Y 21 times. so the answer is B(t/21)
Ans 7:
Class : Class 6
It should be T/21 only as T is the total time and no of times it passes Y is 21.Therefore the answer is T/21
Ans 8:
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10
Ans 9:
Class : Class 9
Yes it should be t/10 as the pendulum will pass through point y twice in its one revolution...... so the the time period should be t/10
Ans 13:
Class : Class 7
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Ans 14:
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10
Ans 15:
Class : Class 8
Here, in this example, the pendulum passes through y 21 times. So, it will do 10 complete oscillations and 1 half which is basically touching y. Therefore, the time period of the pendulum is T/10.
Ans 16:
Class : Class 8
it should be t/10 only as during time period the pendulum will pass through the point y twice.so the time period will be t/10