Asked | Gurucool - Coolfluencing the world

Q21
How many pairs of chromosomes are present in human beings? Out of these how many are sex chromosomes? How many types of sex chromosomes are found in human beings? “The sex of a newborn child is a matter of chance and none of the parents may be considered responsible for it”. Draw a flow chart showing determination of sex of a newborn to justify this statement.

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Q22
(a) State the laws of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum. (b) The absolute refractive indices of two media ‘A’ and ‘B’ are 2.0 and 1.5 respectively. If the speed of light in medium ‘B’ is 2 x 108 m/s, calculate the speed of light in: (i) vacuum, (ii) medium ‘A’.

Free Response Question View solution

Q23
“A convex lens can form a magnified erect as well as magnified inverted image of an object placed in front of it.” Draw ray diagram to justify this statement stating the position of the object with respect to the lens in each case.
An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of the image formed.

Free Response Question Hard View solution

Q24
A student is unable to see clearly the words written on the blackboard placed at a distance of approximately 4 m from him.
Name the defect of vision the boy is suffering from. Explain the method of correcting this defect. Draw ray diagram for the:
(i) defect of vision and also (ii) for its correction.

Free Response Question Hard View solution

Q25
A student adds 2 mL of acetic acid to a test tube containing 2 mL of distilled water. He then shakes the test tube well and leaves it to settle for some time. After about 5 minutes he observes that in the test tube there is:
(A) A clear transparent colourless solution
(B) A clear transparent pink solution
(C) A precipitate settling at the bottom of the test tube
(D) A layer of water over the layer of acetic acid

Single Choice Question Easy View solution

Q26
A student prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below:
(I) Sodium hydroxide solution turns red litmus blue
(II) Sodium hydroxide readily dissolves in water ,
(III) The beaker containing solution appears cold when touched from .outside
(IV) The blue litmus paper turns red when dipped, into the solution
The correct observations are:
(A) I, II and IV (B) I, II and III
(C) only-III and IV (D) only I and II

Single Choice Question Easy View solution

Q27
A student identified the various parts of an embryo of a gram seed and listed them as given below:
(I) Testa (II) Plumule
(III) Radicle (IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are:

Single Choice Question Easy View solution

Q28
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

Single Choice Question Easy View solution

Q29
Study the given diagram and select the correct statement about the device ‘X’:
<img src="" alt="Diagram">

Single Choice Question Easy View solution

Q30
A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :

Single Choice Question Easy View solution

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

2015

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Q27
A student identified the various parts of an embryo of a gram seed and listed them as given below:
(I) Testa (II) Plumule
(III) Radicle (IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are:

Solution

Q28
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

Solution

Q29
Study the given diagram and select the correct statement about the device ‘X’:
<img src="" alt="Diagram">

Solution

Q30
A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :

Solution

Subjects

2015

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Solution

Q27 A student identified the various parts of an embryo of a gram seed and listed them as given below: (I) Testa (II) Plumule (III) Radicle (IV) Cotyledon (V) Tegmen Out of these the actual parts of the embryo are:

Solution

Q28 Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

Solution

Q29 Study the given diagram and select the correct statement about the device ‘X’: <img src="" alt="Diagram">

Solution

Q30 A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :

Solution

Subjects

Q27
A student identified the various parts of an embryo of a gram seed and listed them as given below:
(I) Testa (II) Plumule
(III) Radicle (IV) Cotyledon
(V) Tegmen
Out of these the actual parts of the embryo are:

Q28
Four students A, B, C and D reported the following set of organs to be homologous. Who is correct?

Q29
Study the given diagram and select the correct statement about the device ‘X’:
<img src="" alt="Diagram">

Q30
A student has obtained a point image of a distant object using the given convex lens. To find the focal length of the lens he should measure the distance between the :