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Published on: 25/05/2021
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Questions + Answers key
Take MCQ Science Test1.
Should the heating element of an electric iron be made of iron, silver or nichrome wire?
2.
If refractive index of glass is 1.65, what id the speed of light in glass?
3.
How should a ray of light be incident on a rectangular glass slab so that it comes out from the opposite side of the slab without being displaced?
4.
Focal length of a convex mirror is 10 cm. Find the radius of curvature of the mirror.
5.
The size of an object is 2 cm. The magnification produced by a mirror is +1. What is the size of the image?
6.
The outer surface of a hollow sphere of aluminium of radius 50 cm is to be used as a mirror. What will be the focal length of this mirror? Which type of spherical mirror will it provide?
7.
Between which two points of a concave mirror should an object be placed to obtain a magnification of - 3?
8.
A person uses concave mirror for shaving, where should he position his face in front of it?
9.
What is an offspring?
10.
Who provided experimental evidence to support theory of origin of life from inanimate matter?
11.
What will be the blood groups of offspring's produced by the parents having following genotype?
12.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
13.
Name two allotropes of carbon.
14.
What are ionic bonds?
15.
What is the purpose of quenching steel?
1.
Nichrome should be used as a heating element in an electric iron because its melting point is higher than iron and silver.
2.
\(Refractive\quad index\quad of\quad glass=\frac { Speed\quad of\quad light\quad in\quad vaccum }{ Speed\quad of\quad light\quad in\quad glass } \\ 1.65=\frac { { 3\times 10 }^{ 8 } }{ { v }_{ g } } \\ { v }_{ g }=\frac { { 3\times 10 }^{ 8 } }{ { v }_{ g } } =1.8\times { 10 }^{ 8 }m/s\)
3.
Along the normal to the surface or at an incident angle of i = 0o .
4.
2F = R
Therefore, R = 20 cm
5.
\(m=\frac { Image\quad size }{ Object\quad size } \\ +1=\frac { Image\quad size }{ 2 } =2cm\)
Image size = +2
6.
( )
\(f=\frac { R }{ 2 } =25cm\)
It will form a convex mirror.
7.
The negative sign of magnification shows that the image is real and inverted. Hence, the object must be positioned between F and 2F.
8.
Between pole and principal focus
9.
The organisms resulting due to crossing over and exchange of gene segments are known as offspring.
10.
Urey and Miller.
11.
Male - IA IB Female - IO IA Blood groups will be :
(i) A (ii) A (iii) B (iv) AB
12.
Aluminium.
13.
Diamond and graphite
14.
Bonds formed between a metal and a non-metal by the transfer of electrons are known as ionic bonds.
e.g., Na++Cl−→NaCl
15.
Quenching makes steel very hard and brittle.
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