Physics
Previous year question paper with solutions for Physics May-2017
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Question paper 1
SECTION – A
Q1. (a) Fill in the blanks:
i. Dimensional formula of Gravitational constant is………………. .
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ii. When a man jumps from a floating boat, it moves away from the man due to the Newton’s …….
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iii. Torque acting on a body is defined as the product of …………
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iv. A liquid wets the walls of the containing vessel. The meniscus of the liquid will be ………...
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v. The work done by a coolie, carrying a mass of 30kg over his head covers a distance of 100 meters in the horizontal direction is ………………
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(b) State true or false:
i. Angular velocity is defined as the rate of change of angular displacement of a body.
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ii. Rolling is a combination of rotational and translational motion.
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iii. Attraction force between like molecules is knows as Adhesion.
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iv. With the rise of temperature, generally the viscosity of fluid decreases.
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v. Gaps are left between two rails at the joints to accommodate volume expansion of rails.
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(c) Choose the correct one:
(i) Impulse is the product of force and
(a) area (b) displacement (c) time (d) velocity
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(ii) A particle moves in a circle of radius R with a constant speed under a centripetal force F. the work done in completing a full circle is:
(a) Zero (b) π RF joules (c) 2 π RF joules (d) π R2 F joules
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(iii) The moment of inertia of a ring of mass M and radius R about an axis passing through its centre and perpendicular to the plane of the ring is.
(a) MR2 /2 (b) MR2 /4 (c) MR2 (d) 3MR2 /4
Answer:
(iv) Bernoulli’s theorem is valid in the case of :
(a) Incompressible and non viscous fluid (b) Turbulent motion and non viscous fluid (c) Steady flows and compressible fluid (d) Turbulent flows and incompressible fluid
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(v) The temperature of a body is 90o C. Its temperature in Fahrenheit is given by:
(a) 19.4 (b) 124 (c) 164 (d) 194
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SECTION B
Q2. Attempt any six questions:
i. Define scalar and vector quantities with example
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ii. What are significant figures? Give rules for finding significant figures.
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iii. Find the expression for work done in moving an object on horizontal and inclined plane (incorporating frictional forces).
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iv. If A = i + 4 j + 3 k and B = 4 i + 2 j – 4 k Find their scalar product.
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v. State and prove theorem of perpendicular axis.
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vi. An electric motor lifts a load of 180 kg to a height of 30 m in 2 minutes. Find the power of motor?
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vii. What are the three modes of heat transfer? Explain with examples.
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viii. Derive expression for terminal velocity.
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SECTION C
Attempt any three questions:
Q3. Discuss Newton’s laws of Motion in detail.
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Q4. Explain the Concept of friction and give its applications.
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Q5. Discuss principle of conservation of mechanical energy for a freely falling body.
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Q6. What do you mean by Co-efficient of linear, surface and cubical expansions and give relation among them?
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Q7. (a) A metal cube, having each side 10 cm is subjected to a tangential force of 104 N. The upper face of the cube is displaced through 0.2 m.m with respect to the bottom face. Find the value of the modulus of rigidity (in Nm–2 ).
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(b) Define Hooke’s law by drawing stress – strain diagram.
Answer:
Question paper 2
SECTION A
Q1 Fill In The Blanks.
a. Focal length of a telescope is …………..
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b. SI unit of electric flux is ………………..
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c. The device which converts a.c. into d.c. is called …………..
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d. The materials which are weakly repelled by a magnet are called ………….
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e. 1 Tesla = …………. Gauss.
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State True Or False.
f. A concave mirror always produces a real image.
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g. A dielectric is a non conducting material which separates the plates of a capacitor.
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h. AC generator works on the principal of electromagnetic induction.
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i. Total internal reflection is used in optical fibres.
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j. A laser is a coherent source because it contains many wavelength.
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CHOOSE CORRECT ONE.
k. Magnification produced by a plane mirror is:
(a) +1 (b) +2 (c) +1/2 (d) -1
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l. The law that governs the force between electric charges is called:
(a) Gauss’s Law (b) Coulomb’s Law (c) Faraday’s Law (d) Ohm’s Law
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m. He- Ne Laser is a :
(a) Two level laser (b) three level laser (c) four level laser (d) five level laser
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n. The CGS unit of magnetic field B is:
(a) Tesla (b) gauss (c) TmA2 (d) Am2
Answer:
o. Slide wire bridge is an application of:
(a) Wheatstone bridge (b) Potentiometer (c) Neither (a) nor (b) (d) None of these
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SECTION B
Q2 Attempt any six Questions.
i. Define refraction and give its laws
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ii. What is meant by power of a lens? Give units of power of lens.
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iii. Find the electric field due to a point charge of 2µC at a distance of 9m in vacuum.
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iv. Convert 1 KWh into Joule.
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v. Define current. What is AC and DC?
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vi. Write down the properties of LASER.
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vii. State and explain Ohm’s law with circuit diagram.
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viii. Differentiate between intrinsic and extrinsic type semiconductors.
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SECTION C
Attempt Any Three Questions:
Q3. With the help of ray diagrams explain the different types of image formation by a convex lens.
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Q4. (a) State and explain gauss’s theorem.
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(b) Calculate the electrostatic force between a proton and an electron separated by a distance of 10 nm in vacuum.
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Q5. (a) Differentiate between E.M.F. and Potential difference.
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(b) Define magnetic flux. Write down its properties.
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Q6. Explain the working of p-n junction diode in detail with diagram.
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Q7. (a) Write down the applications of optical fibres in detail.
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(b) Three capacitors each of 3 pF are connected in series to each other. Find their equivalent capacitance.
Answer: