Subject :NSO Class : Class 7
Class : Class 7
Answer is (a). This is observed due to this reasonThere's a line which is making an angle 55° and is a linear pair. Hence the angle of line (mirror) p is 180°. But 55° is not the angle of incidence. To get the sum of angle of incidence and reflection, we multiply 55° by 2 and get 70°. Since angle of incidence =angle of reflection, 70°÷2=35°. The angle of incident ray and the reflected ray of P and Q are same thus the sum of the angle of incidence and angle of reflection would be the same (70°). We know, angle of incidence=angle of reflection, hence 70°÷2=35°. Or A=35°
Subject :NSO Class : Class 4
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Subject :NSO Class : Class 3
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Subject :NSO Class : Class 7
Ans 2:
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 7:
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 9:
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 10:
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 12:
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 11:
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 2:
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 ?