Class 10th science notes
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What is the law of reflection that states the incident ray, reflected ray, and normal lie in the same plane?
Anonymous Quiz
54%
First law
28%
Second law
6%
Third law
13%
Snell's law
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For a concave mirror, when the object is at the focal point, the image is formed at?
Anonymous Quiz
16%
Focal point
23%
Center of curvature
49%
Infinity
12%
Behind the mirror
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The ability of a lens to converge or diverge light rays is known as its?
Anonymous Quiz
25%
Focal length
38%
Power
27%
Magnification
10%
Aperture
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In the lens formula, 1/f = 1/v - 1/u, what is the sign convention for a convex lens when the image is real?
Anonymous Quiz
43%
v positive
36%
v negative
14%
u positive
8%
f negative
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Which of the following is a balanced chemical equation?
Anonymous Quiz
17%
H2 + O2 β†’ H2O
69%
2H2 + O2 β†’ 2H2O
8%
H2 + 2O2 β†’ 2H2O
7%
2H2 + 2O2 β†’ 2H2O
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What type of reaction is represented by the equation: 2Mg + O2 β†’ 2MgO?
Anonymous Quiz
10%
Decomposition
82%
Combination
5%
Displacement
2%
Double displacement
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In a chemical equation, the arrow indicates?
Anonymous Quiz
65%
Direction of reaction
19%
Equality
7%
Reversibility
9%
Catalyst
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Which reaction releases heat?
Anonymous Quiz
16%
Endothermic
79%
Exothermic
4%
Neutralization
1%
Precipitation
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In the reaction CuO + H2 β†’ Cu + H2O, which substance is reduced?
Anonymous Quiz
53%
CuO
16%
H2
24%
Cu
8%
H2O
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Chemical Reactions and Equations.pdf
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Chemical reaction and equation most important questions ❀️

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Acids bases and salts .pdf
6.6 MB
Best notes with Important questions
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Science-MS.pdf
804.5 KB
2025-26 sample paper and marking scheme ❀️
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A reaction where a single compound breaks down into two or more products is?
Anonymous Quiz
15%
Combination
75%
Decomposition
5%
Displacement
5%
Double displacement
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