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# CBSE Class 12 Physics Solved Practice Paper: Set – XIV CBSE Solved Practice Papers and CBSE Solved Sample Papers of CBSE Class 12 Physics are very important and useful source for the preparation of CBSE Class 12 Physics board examinations.

If we analyse previous year question papers of CBSE Class 12 Physics then we will notice that there are some very important concepts, questions based on these concepts are frequently asked in CBSE Class 12 Physics board examinations.

This CBSE Practice Paper for Class 12 Physics is based on such frequently asked questions.

The pattern of this practice paper is same as that CBSE Class 12 Physics Board examination 2016. This paper is based on the latest CBSE Syllabus for Class 12 Physics 2017.

All the questions of this practice paper are important for CBSE Class 12 Physics board examination 2017.

According to the latest pattern, in CBSE Class 12 Physics question paper:

 All questions are compulsory There are 26 questions in all Question number 1 to 5 carry one mark each Question number 6 to 10 carry two marks each Question number 11 to 22 carry three marks each Question number 23 carry four marks Question number 24 to 26 carry 5 marks each There is no overall choice. However, internal choices have been provided in some questions Use of calculator is not permitted

Importance of this Solved Practice Paper for CBSE Class 12 Physics:

With the help of this Solved Practice Paper for CBSE Class 12 Physics student will:

 Understand the latest CBSE Class 12 Physics board examination 2017 Know about the important concepts of CBSE Class 12 Physics which are frequently repeated in CBSE board examinations Learn time management by practicing questions Understand how to give solutions of the question, in order to score maximum marks

Question: Name the part of the electromagnetic spectrum of wavelength 10– 2 m and mention its one application.

Solution:

Spectrum of wavelength 10‒2 m belongs to microwaves. It is used in RADAR.

Question: What is the difference between kilowatt (kW) and kilowatt hour (kWh)?

Solution:

Kilowatt (kW) is a unit of power whereas kilowatt hour (kWh) is a unit of electrical energy.

1 kW = 1000 W and 1 kWh = 3.6 ×106 J.

Question: Name the absorbing material used to control the reaction rate of neutrons in a nuclear reactor.

Solution:

Question: Where on the surface of the earth is the angle of dip 900.

Solution:

Angle of dip is 900 above Earth’s Magnetic North and South Pole.

Question: What is the focal length and power of a plane glass plate?

Solution:

For a plane glass plate: Focal length = ∞, Power = 0.

Question: Explain the following, giving reasons:

(i) When monochromatic light is incident on a surface separating two media, the reflected and refracted light both have the same frequency as the incident frequency.

(ii) When light travels from a rarer to a denser medium, the speed decreases.

Does this decrease in speed imply a reduction in the energy carried by the wave?

(iii) In the wave picture of light, intensity of light is determined by the square of the amplitude of the wave. What determines the intensity in the photon picture of light?

Solution:

(i) When light enters from one medium to another medium then, only its frequency remains constants whereas its velocity and wavelength changes.

Due to this reason, the reflected light and refracted light both has same frequency and as the incident frequency.

(ii) No, because energy carried by light wave does not depends on speed of the light wave.

(iii) The intensity in the photon picture of light is determined by the number of photons per unit area per unit time.