Download 12th cg english medium set c physics

HIT TUTORIALS TEST CG SET – C 12TH
SUBJECT – PHYSICS
1.
(A) multiple choice question
i. If the focal length of convex lens is 225 cm. then its power will be:
(a) 5D
(b) 4 𝐷
(c) 10 𝐷
(d) 25 𝐷
ii. The S.I. unit of electric field intensity is :
(a) 𝑛𝑒𝑤𝑡𝑜𝑛/𝑐𝑜𝑢𝑙𝑜𝑚𝑏
(b) 𝑗𝑜𝑢𝑙𝑒/𝑐𝑜𝑢𝑙𝑜𝑚𝑏
(c) volt-meter
(d) 𝑛𝑒𝑤𝑡𝑜𝑛/𝑚𝑒𝑡𝑒𝑟
iii. In presence of dielectric medium electric field intensity
(a) Decreases
(b) increases
(c) becomes zero
(d) does not change
iv. One 𝛽 − particle is moving parallel to magnetic field, them force on it will be:
(a) 2 newton
(b) 0.2 newton
(c) zero
(d) infinite
v. With increase in temperature the resistance of semiconductor:
(a) Increases
(b) Decreases
(c) Remains same
(d) none of these
(B) Fill in the blanks:
i. The substance whose resistance becomes zero at very low temperature is called ……………………
ii. The reciprocal of specific resistance of material of a substance is known as ………………..
iii. The process of emission of electron metal surface is known as …………………
iv. When cathode rays strike the high atomic weight substance then …………… are produced.
v. Optical fibre work on …………………….. principle.
Instruction: - Q no. 2 to 6 are very short answer type question each question carries 2 marks.
2.
Give two difference B/w emF & potential difference
3. What is magnetic flux?
4. State long’s law & name the law which is equivalent to this law?
5. Give the logic symbol, Boolean , expression & truth table for or gate.
6. Find out equivalent resistance.
Instruction: -. 7 to 10 are very short answer type question, each question carries 3 marks.
7. Explain the principle of vibration magnetometer. Obtain an expression for the time period of a magnet
when it has been adjusted in magnetic meridian.
8. What is self-induction? What meant by self-induction of coil? Explain write its unit.
9. Show that the de-Broglie wavelength for an electron accelerates through a potential of V volt is given by.
10. What is geostationary satellite? What is its period of revolution? Mention its important use.
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Instruction: - questions No 11 to 14 are short answer type question each question carries 4 marks
11. Draw the ray diagram of refraction through a lens and derive the refraction formula.
OR
Draw the ray diagram of simple microscope and obtain an expression for its magnifying power.
12. Draw the labelled diagram of a terrestrial telescope and establish the expression for its magnifying
powers when the final image is formed at least distance of distinct vision.
OR
What is dispersion without deviation? Deduce a suitable condition for it and calculate resultant
dispersions.
13. 6000 Å wavelength is used to produce interference pattern on the screen at a distance of 2m.
(i)
If the fringe width is 2mmm then find the distance between the slits.
(ii)
If the wavelength is increased to 4800 Å. What will be the fringe width?
OR
Two waves of amplitudes 3 mm and 4 mm moving in the same direction interfere. Find the resultant
amplitude where the phase differences are: (i) zero (ii) 𝜋
14. What is fax explain with block diagram?
OR
How does modem works with block diagram?
Instruction: Question no. 15 to 17 are long answer type question each question carries 5 mark
15. Describe the experiment to compare the magnetic moments of two bar magnets using deflection
magnetometer by deflection method in tan A position under the heads:
(1) Force diagram of tan A position of gauss, (2) derivation of formula, (3) observation table,
(4) precautions.
OR
What is tangent law? State and prove it. What are the conditions of tangent law?
16. Using gauss’s theorem, find he expression for electric field intensity at a distance r from a uniformly
charged spherical shell of radius R in the following situations:
OR
Establish the expression for torque acting on a bar magnet placed in a uniform magnetic field at an angle
𝜃 with the field and hence define magnetic moment and write its S. I. unit
Instruction: question No. 18 and 19 are long answer type of questions each question carries 6 marks.
17. Explain p and n-type semiconductors? What are the differences between n-type and p-type
semiconductors?
OR
Give difference between intrinsic and extrinsic semiconductors. Any three.
18. Derive an expression for magnetic field intercity at a point on the axis of current carrying circular coil.
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Numerical related to conversion of galvanometer in to ammeter and voltmeter.
19. Proof for a long solenoid by amperes circuital Law B = 𝜇0 𝑛𝑖 0
OR
Explain self-inductance. Derive an expression for self-inductance of a long solenoid. Self-inductance of a
long solenoid depends upon which main point? Explain briefly.
Anupam nagar chowk,jodhpur sweets,harbans complex, 2nd floor,rajnandgaon (c.g.) 9111599995, 9111499994
Anupam nagar chowk,jodhpur sweets,harbans complex, 2nd floor,rajnandgaon (c.g.) 9111599995, 9111499994
Anupam nagar chowk,jodhpur sweets,harbans complex, 2nd floor,rajnandgaon (c.g.) 9111599995, 9111499994