1st Year Physics Past Papers

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• 1- The cross product of two anti-parallel vectors is:  (a) 0  (b) 1  (c) Maximum  (d) Negative
• 2- Michelson interferometer can be used to find:  (a) wavelength of light  (b) wavelength of sound  (c) velocity of sound  (d) velocity of light
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• 3- The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm then what is the focal length of eye-piece?  (a) 10 cm  (b) 100 cm  (c) 1000 cm  (d) 5 cm
• 4- When speed of a body is doubled then its:  (a) K.E is doubled  (b) P.E is doubled  (c) acceleration is doubled  (d) momentum is doubled
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• 5- When temperature of source and sink of a heat engine becomes equal then the entropy change will be:  (a) zero  (b) minimum  (c) maximum  (d) negative
• 6- The distance between two consecutive crests is called:  (a) displacement  (b) amplitude  (c) wave front  (d) wavelength
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• 7- If a body of mass 1kg is allowed to fall freely then its weight becomes:  (a) 1N  (b) 9.8 N  (c) 980 N  (d) zero
• 8-If the time period of a pendulum is 2 seconds then its frequency will be:  (a) 1 Hz  (b) 2 Hz  (c) 0.5 Hz  (d) 0.25 Hz
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• 9- If blue light is used as compared to red light then fringe spacing:  (a) increases  (b) decreases  (c) remains same
• (d) becomes zero
• 10- If A=2i+3j-K and B = 41+6j-2K. The angle between them will be:  (a) 0°  (b) 45°  (c) 60°  (d) 90°
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• 11- Error in the measurement of radius of sphere is 1%. The error in the calculated value of its area is:  (a) 1%  (b) 2%  (c) 3%  (d) 4%
• 12- If the mass of a body is doubled, then acceleration becomes:  (a) one fourth  (b) half  (c) double  (d) constant
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• 13-The diastolic pressure of a normal healthy person is:  (a) 70 to 75 torr  (b) 75 to 80 torr  (c) 80 to 85 torr  (d) 70 to 80 torr
• 14- If a stretched string is 2m, and it has 2 loops of stationary waves then wavelength is:  (a) 4 m (b) 3 m  (c) 2 m  (d) 1 m
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• 15-Which one of the following processes is irreversible?  (a) slow compression of an elastic spring  (b) slow evaporation of a substance in an isolated vessel  (c) slow compression of a gas  (d) a chemical explosion
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• 16-The dimensions of centripetal force arc:  (a) [MLT-1]  (b) [ML2T-2]  (c) [MLT-2]  (d) [ML-2T-2]
• 17- Work has the same dimensional formula as:  (a) torque  (b) momentum  (c) force  (d) angular acceleration
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• 2. Write short answers to any Eight questions:
• i- Define metre and kilogram.
• ii- What is meant by scientific notation? Explain.
• iii- How do you assess the total uncertainity in the final result for multiplication and division? Explain with example.
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• iv- Write down the two uses of dimensional analysis.
• v- To get the sum of two vectors equal to null vector, what are conditions?
• vi- What is the orientation of vector R when Rx and Ry have opposite signs?
• vii-If A=4+3j then find A.
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• viii- How the acceleration and distance covered by a body can be measured from velocity-time graph?
• ix- State Newton's third law of motion and give its two examples.
• x- What are the circumstances for which the velocity and acceleration of a car are   i) parallel,   ii) perpendicular to each other?
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• xi- Explain, how the swing is produced in a fast moving tennis ball?
• xii- What is meant when we say fluid is non-viscous and incompressible?
• 3. Write short answers to any Eight questions:
• i- Calculate the velocity of a body with which it should be projected upward so that it does not come back to earth.
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• ii- An object has 1 J of potential energy. Explain what does it mean?
• iii- How can you calculate work done by a force acting on an object from force-displacement graph?
• iv- Derive the relation between radian, degree and revolution. 
• v- Give an example to illustrate law of conservation of angular momentum.
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• vi- What is meant by moment of inertia? Explain its significance?
• vii- Describe some common phenomena in which resonance plays an important role.
• viii- Does frequency depend on amplitude for harmonic oscillators?
• ix- What happens to the period of simple pendulum if length is doubled? 
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• x- Why does sound travel faster in solids than in gases?
• xi- Is it possible for two identical waves travelling in the same direction along a string to give rise to a stationary wave?
• xii- What do you mean by "Sonar Technique"?
• 4. Write short answers to any SIX questions:
• i- How would you distinguish between the unpolarized light and polarized light?
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• ii- An oil film spreading over a wet footpath shows colours. Explain how does it happen?
• iii- Define diffraction of light.
• iv- Specific heat of a gas at constant pressure is greater than specific heat at constant volume. Why?
• v- Is it possible to construct a heat engine that will not expel heat into the atmosphere? Explain.
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• vi- What is a Diesel engine? Explain.
• vii- Give any four postulates of kinetic theory of gases.
• viii- Draw the schematic diagram of refrigerator.
• ix- How the power is lost in optical fibre through dispersion?
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