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Physics Case study (4 Marks)

MODEL PAPER 10 · CBSE STD 12 Science (CBSE - English Medium). 2 questions.

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Case study (4 Marks)

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Question 14 Marks
Electric field lines as a path, straight or curved in an electric field such that tangent to it at any point gives the direction of electric field intensity at the point. Electric field lines are continuous curves they start from a positive charged body and end at the negatively charged body. (Refer image) 
Image
(i) Electric field due to a single charge is:
(a) cylindrically symmetric (b) symmetric (c) asymmetric (d) spherically symmetric

(ii) The SI unit of electric field intensity is:
(a) $N / C$ (b) N (c) $C / m ^2$ (d) $N / m^2$

(iii) Pick the wrong statement.
(a) Electric field lines are continuous
(b) Electric field lines can intersect each curves. other.
(c) Electric field lines are always normal to
(d) The electrostatic field does not form a the surface of a conductor. closed loop.

(iv) A metallic sphere is placed in a uniform electric field as shown in the figure. Which path is followed by electric field lines? 
Image
(a) path 'd' (b) path ' c ' (c) path 'a' (d) path 'b'

OR

Pick the true statements about electric field lines.
(a) Electric field lines provide information
(b) Electric field lines provide about the field strength. information about the type of charge.
(c) All of these.
(d) Electric field lines provide information about the direction of the electric field.
Answer
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Question 24 Marks
Radio waves are produced by the accelerated motion of charges in conducting wires. Microwaves are produced by special vacuum tubes. Infrared waves are produced by hot bodies and molecules also known as heat waves. UV rays are produced by special lamps and very hot bodies like Sun.
Image
(i) Solar radiation is
i. transverse electromagnetic wave
ii. longitudinal electromagnetic waves
iii. both longitudinal and transverse electromagnetic waves
iv. none of these.
(a) Option (i) (b) Option (iv) (c) Option (iii) (d) Option (ii)

(ii) What is the cause of greenhouse effect?
(a) Ultraviolet rays (b) X-rays (c) Infrared rays (d) Radiowaves

(iii) Biological importance of ozone layer is
(a) it stops ultraviolet rays
(b) none of these.
(c) it reflects radiowaves
(d) It layer reduces greenhouse effect

OR

Ozone is found in
(a) troposphere (b) mesosphere (c) ionosphere (d) stratosphere

(iv) Earth's atmosphere is richest in
(a) ultraviolet (b) infrared (c) X-rays (d) microwaves
Answer
Radio waves are produced by the accelerated motion of charges in conducting wires. Microwaves are produced by special vacuum tubes. Infrared waves are produced by hot bodies and molecules also known as heat waves. UV rays are produced by special lamps and very hot bodies like Sun. 
Image
(i) (a) Option (i)
Explanation: transverse electromagnetic wave

(ii) (c) Infrared rays 
Explanation: Greenhouse effect is due to infrared rays.

(iii) (a) it stops ultraviolet rays
Explanation: Ozone layer absorbs the harmful ultraviolet radiations coming from the sun.

OR

(d) stratosphere
Explanation: Ozone layer lies in stratosphere.

(iv) (b) infrared
Explanation: The atmosphere of earth is richest in infrared radiation.
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Case study (4 Marks) - Physics STD 12 Science Questions - Vidyadip