English Medium Class 10 - CBSE Question Bank Solutions for Science

Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the ______.

Rohit wants to have an erect image of an object using a converging mirror of focal length 40 cm.

1. Specify the range of distance where the object can be placed in front of the mirror. Justify.
2. Draw a ray diagram to show image formation in this case.
3. State one use of the mirror based on the above kind of image formation.

The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10^-8 Ω, find the length of this wire.

Consider the following chemical equation I and II

1. \[\ce{Mg + 2HCl -> MgCl_2 +H_2}\]
2. \[\ce{NaOH +HCl -> NaCl + H_2O}\]

The correct statement about these equations is:

In the given diagram:

1. Name the parts labelled A, B, and C.
2. Write the functions of A and C.
3. Reflex arcs have evolved in animals? Why?

How will the resistance of a wire be affected if its

1. length is doubled, and
2. radius is also doubled ?

Give justification for your answer.

State the change in colour observed in following case mentioning the reason:

A piece of zinc is dipped in ferrous sulphate solution.

The correct pattern of magnetic field lines of the field produced by a current carrying circular loop is:

Sensory nerve of a reflex arc carries information from the receptor cells to the ______.

The colour of the solution observed after 30 minutes of placing zinc metal in copper sulphate solution is ______.

A 10 cm long pencil is placed 5 cm in front of a concave mirror having a radius of curvature of 40 cm.

1. Determine the position of the image formed by this mirror.
2. What is the size of the image?
3. Draw a ray diagram to show the formation of the image as mentioned in part (i).

Give the structure of alcohol with 4 carbon atoms.

Write two methods of preventing the rusting of iron.

A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence. On analyzing the ray diagrams, which one of the following conclusions is he likely to draw?

(A) The emergent ray is parallel to the incident ray.

(B) The emergent ray bends at an angle to the direction of the incident ray.

(C) The emergent ray and the refracted ray are at right angles to each other.

(D) The emergent ray is perpendicular to the incident ray.

A narrow beam PQ of white light is passing through a glass prism ABC as shown in the diagram.

Trace it on your answer sheet and show the path of the emergent beam as observed on the screen DE.

(i) Write the name and cause of the phenomenon observed.

(ii) Where else in nature is this phenomenon observed?

(iii) Based on this observation, state the conclusion which can be drawn about the constituents of white light.

In the following diagram, the path of a ray of light passing through a glass prism is shown:

In this diagram the angle of incidence, the angle of emergence and the angle of deviation respectively are (select the correct option):

(A) X, R and T

(B) Y, Q and T

(C) X, Q and P

(D) Y, Q and P

Study the following diagrams in which the path of a ray of light passing through a glass prism as traced by four students P, Q, R and S is shown:

The student who has traced the path correctly is

(A) P

(B) Q

(C) R

(D) S

Describe an activity to show that colours of white light splitted by a glass prism can be recombined to get white light by another identical glass prism. Also draw ray diagram to show the recombination of the spectrum of white light.