10th Standard CBSE Syllabus & Materials
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Published on: 25/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Write a balanced chemical equation for the following reaction. Ethanol is warmed with ethanoic acid to form ethyl acetate in the presence of concentrated HSO4, 2SO 4.
2.
Should the heating element of an electric iron be made of iron, silver or nichrome wire?
3.
What is the magnification of the images formed by plane mirror and why?
4.
What will happen to ray of light when it falls normally on a surface?
5.
Give uses of concave mirror.
6.
A ray of light enters a rectangular glass slab of refractive index 1.5. It is found that the ray emerges from the opposite face of the slab without being displaced. If its speed in air is \(3\times { 10 }^{ 8 }\)m/s, then what is its speed in glass?
7.
Define one dioptre.
8.
Name the point inside the lens through which a ray of light goes undeviated.
9.
A person uses concave mirror for shaving, where should he position his face in front of it?
10.
What are inherited traits? Give an example.
11.
Mendel crossed a pure white recessive pea plant with a dominant pure red flowered plant. What will be the first generation of hybrids?
12.
If the sperm bearing Y - Chromosome fertilizes an egg, the child born will not be entirely like his father? Why?
13.
What is speciation?
14.
Name two allotropes of carbon.
15.
Name two metals which do not react with oxygen.
1.
C2H2OH+CH3COOH\(\overset { Conc.{ H }_{ 2 }{ SO }_{ 4 } }{ \underset { Esterification }{ \longrightarrow } } \) CH3COOH+H2O.
2.
Nichrome should be used as a heating element in an electric iron because its melting point is higher than iron and silver.
3.
The magnification of the image formed by a plane mirror is 1 because size of the image is equal to the size of the object.
4.
No bending of light ray occurs i.e., the light rays goes straight from one medium to another.
5.
(a) Used in torches, search lights and vehicle headlights.
(b) Used as shaving mirror.
(c) Used by dentist.
(d) Used in solar furnance
6.
Since, \(n=\frac { c }{ v } \)
We get, \(v=\frac { c }{ v } =\frac { { 3\times 10 }^{ 8 } }{ 1.5 } =2\times { 10 }^{ 8 }m/s.\)
7.
It is the power of a lens of focal length one metre.
8.
Optic center
9.
Between pole and principal focus
10.
The characteristics which are transmitted from parents to off springs are called inherited traits. Example - Free and attached earlobes.
11.
All red.
12.
This is because, the X - chromosome will also have its effect and show their characteristics.
13.
The process by which new species develop from the existing species is known as speciation.
14.
Diamond and graphite
15.
Gold and silver.
10th Standard CBSE Syllabus & Materials
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