Asked | Gurucool - Coolfluencing the world

Class 6	Science Mathematics Social Science	English Hindi Computer
Class 7	Science Mathematics Social Science	English Hindi Computer
Class 8	Science Mathematics Social Science	English Hindi Computer
Class 9	Science Mathematics Social Science	English Hindi Computer
Class 10	Science Math Social Science	English Hindi Computer
Class 11	Physics Chemistry Biology	Mathematics English Economics
Class 12	Physics Chemistry Biology	Mathematics English Economics
Class 5	EVS
College Entrance	Jamia Millia Islamia Aligarh Muslim University Banaras Hindu University

2012

Q21
List the new Cartesian sign convention for reflection of light by spherical mirrors. Apply these conventions for calculating the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.

Solution

Solution

Q23
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing the process of germination of pollen grains on stigma and label the following parts:(i) Female germ cell; (ii) Male germ cell; (iii) Ovary

Solution

Q24
Draw a diagram of human female reproductive system and label the part (i) that produces eggs.
(ii) where fusion of egg and sperm takes place.
(iii) where zygote is implanted.
What happens to human egg when it is not fertilised?

Solution

Q25
The aqueous solutions of copper sulphate and zinc sulphate appear,
"(A) blue and green respectively (B) green and colourless respectively
(C) blue and brown respectively (D) blue and colourless respectively"

Solution

Q26
On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes

Solution

Q27

Solution

Q28
(A) a distant tree or an electric pole
(B) a well-illuminated distant building
(C) well-lit grills of the nearest window
(D) a burning candle placed at the distant edge of the laboratory table

Solution

Q29
If you are to determine the focal length of a convex lens, you should have ,
"(A) a convex lens and a screen
(B) a convex lens and a lens holder
(C) a lens holder, a screen holder and a scale
(D) a convex lens, a screen holder for them and a scale."

Solution

Q30
Four students showed the following traces of the path of a ray of light passing througha rectangular glass slab.

Solution

Subjects

2012

Q21 List the new Cartesian sign convention for reflection of light by spherical mirrors. Apply these conventions for calculating the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.

Solution

Solution

Q23 Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing the process of germination of pollen grains on stigma and label the following parts:(i) Female germ cell; (ii) Male germ cell; (iii) Ovary

Solution

Q24 Draw a diagram of human female reproductive system and label the part (i) that produces eggs. (ii) where fusion of egg and sperm takes place. (iii) where zygote is implanted. What happens to human egg when it is not fertilised?

Solution

Q25 The aqueous solutions of copper sulphate and zinc sulphate appear, "(A) blue and green respectively (B) green and colourless respectively (C) blue and brown respectively (D) blue and colourless respectively"

Solution

Q26 On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes

Solution

Q27

Solution

Q28 (A) a distant tree or an electric pole (B) a well-illuminated distant building (C) well-lit grills of the nearest window (D) a burning candle placed at the distant edge of the laboratory table

Solution

Q29 If you are to determine the focal length of a convex lens, you should have , "(A) a convex lens and a screen (B) a convex lens and a lens holder (C) a lens holder, a screen holder and a scale (D) a convex lens, a screen holder for them and a scale."

Solution

Q30 Four students showed the following traces of the path of a ray of light passing througha rectangular glass slab.

Solution

Subjects

Q21
List the new Cartesian sign convention for reflection of light by spherical mirrors. Apply these conventions for calculating the focal length and nature of a spherical mirror which forms a 1/3 times magnified virtual image of an object placed 18 cm in front of it.

Q23
Distinguish between unisexual and bisexual flowers giving one example of each. Draw a diagram showing the process of germination of pollen grains on stigma and label the following parts:(i) Female germ cell; (ii) Male germ cell; (iii) Ovary

Q24
Draw a diagram of human female reproductive system and label the part (i) that produces eggs.
(ii) where fusion of egg and sperm takes place.
(iii) where zygote is implanted.
What happens to human egg when it is not fertilised?

Q25
The aqueous solutions of copper sulphate and zinc sulphate appear,
"(A) blue and green respectively (B) green and colourless respectively
(C) blue and brown respectively (D) blue and colourless respectively"

Q26
On adding acetic acid to sodium hydrogen carbonate in a test tube, a student observes

Q28
(A) a distant tree or an electric pole
(B) a well-illuminated distant building
(C) well-lit grills of the nearest window
(D) a burning candle placed at the distant edge of the laboratory table

Q29
If you are to determine the focal length of a convex lens, you should have ,
"(A) a convex lens and a screen
(B) a convex lens and a lens holder
(C) a lens holder, a screen holder and a scale
(D) a convex lens, a screen holder for them and a scale."

Q30
Four students showed the following traces of the path of a ray of light passing througha rectangular glass slab.