Name of the Organisation : University Of Library - Cochin University of Science and Technology
Name of the Exam : Common Admission Test (CAT)
Document Type : Sample Question Paper
Year: 2016
Subject: Physics PG (Final)

Website : www.library.cusat.ac.in/cat/2016/
Download Model/Sample Question Papers: http://www.indianjobtalks.com/uploads/76252-Physics.pdf

CAT Physics PG Final Model Question Paper :
1. How much of energy is to be added to an ice cube of 200 grams at 0oC to convert to water at same temperature?
A. 6.69 kJ
B. 66.9 kJ
C. 6.69 kCal
D. 66.9 kCal

2. The actual work done by a heat engine in one hour is 2.7×106 Joules, while the frictional losses in the engine are 6×105 Joules. The engine operates between temperature of 500 K and 1000 K. What is the overall efficiency of the engine?
A. 50%
B. 4.5%
C. 41%
D. 25%

3. Light of wavelength 497 nm appears to have a wavelength of 500.2 nm when it reaches earth from a distant star. What is the velocity of the star if the velocity of light is 3×108 m/s?
A. 2×106 m/s
B. 108 m/s
C. 9.6 ×108 m/s
D. 107 m/s

4. A cube of 1 cm side is placed in an electric field of 100 N/C. What will be the net flux through the cube if the electric field is perpendicular to the left face of the cube?
A. 0
B. 100 N/C
C. 50 N/C
D. 1 N/C

5. A total electric charge of 8 nC is distributed uniformly over the surface of a metal sphere of radius 27 cm. If the potential is zero at a point at infinity, what will be the potential at a point 8 cm from the centre of the sphere?
A. 266 volts
B. 138 volts
C. 100 volts
D. 500 volts

6. What must be the charge of a particle of mass 5 grams be for it to remain stationary when placed in a down ward directed electric field of magnitude 800 N/C?
A. 0.0000613 C
B. - 0.0000613 C
C. 0.0000160 C
D. - 0.0000160 C

7. Two long straight wires carrying a current I and separated by a distance r exert a force F on each other. If the current is increased to 4I and the distance reduced to r/6, then the force between the wires will be
A. F
B. 1.5 F
C. 96 F
D. 576 F

8. A person stands 40 m from a flag pole. The angle at the top of the flag pole with the horizontal at eye is 25o. What is the height of the flag pole, if the distance between the eye of the person to his feet is 1.8 m?
A. 20.4 m
B. 200.4 m
C. 40 m
D. 400 m

9. A capacitance of 0.4 µF is connected to an alternating emf of 100 Hz. What is the capacitive reactance?
A. 3981 Hernries
B. 3981 ohms
C. -3981 ohms
D. +3981 Henries

10. How many protons, neutrons and electrons are there in 3He ?
A. 2, 1, 2
B. 3, 2, 2
C. 2, 3, 2
D. 3, 2, 3

11. The binding energy per nucleon for 238U is about 7.6 MeV, while it is about 8.6 MeV for nuclei of half that mass. If a 238U nucleus were to split into two equal size nuclei, about how much energy would be released in the process?
A. 476 MeV
B. 238 MeV
C. 119 MeV
D. 0 MeV

12. Three forces acting on a particle are given by F1 = 20i – 36j + 73k N, F2 = ?17i +21j – 46k N and F3 = ?12k N. What is the magnitude of the resultant force?
A. 21.4 N
B. 3 N
C. -3 N
D. -21.4 N

13. When a mass of 400 grams is hung at the end of a vertical spring, the spring stretches 30cm. What is the spring constant of the spring?
A. 13.07 N.m
B. 13.07 N/m
C. 133.3 N.m
D. 133.3 N/m

14. A 20 g piece of aluminum (c ? 0.21 cal / g.oC) at 90oC is dropped into a cavity in a large block of ice at 0oC. How much ice does the aluminum melt?
A. 47 g
B. 0.47 g
C. 20 g
D. 4.7 g

15. Efficiency of a heat engine is defined as
A. ratio of heat input and work output
B. product of heat input and work output
C. ratio of work output and heat input
D. ratio of work input and heat output

16. A conductor has a resistance of 1 ohm if the current in it is 1 ampere for a potential difference of 1 volt. This is
A. Ohm’s law
B. Gauss law
C. Coulumb’s law
D. Lenz’s law

17. A material evaporates when
A. its melting point is higher than room temperature
B. its vapor pressure is less than atmospheric pressure
C. its vapor pressure is higher than atmospheric pressure
D. its melting point is less than room temperature

18. On a rainy day, thin oil films on water show different colours, due to
A. dispersion
B. interference
C. polarization
D. diffraction

19. The Laplace transform of the function e-at has the form
A. 1/(s+a)
B. 1/s(s+a)
C. a/s
D. (s+a)

20. What energy transformation takes place when ice is converted to water?
A. heat energy to latent heat
B. heat energy to potential energy
C. heat energy to kinetic energy
D. kinetic energy to heat energy