PHYSICS TEST 1 - PAK ARMED FORCES TEST

QUIZ START

Results

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QUIZ START

#1. A vector having magnitude equal to given vector but in opposite direction is called

Position vector

Unit vector

Positive vector

Negative vector

#2. If A = 3i + 6j, B = xi + k and A.B = 12, then x will be equal to

#3. When two equal and opposite vectors are added, then their resultant will have

Zero magnitude

Half magnitude

Double magnitude

Same magnitude

#4. In SI system of units, the velocity is measured in

foot per second

miles per second

centimeter per second

meter per second

#5. A ball is thrown vertically upward with an initial velocity of 49 m/s. The maximum height it will reach will be

755 m

122.5 m

500 m

245 m

#6. The terminal velocity of a rain droplet of mass m and radius r is

mg / 6πηr

mg ηr / 6π

6π ηr / mg

6πηmgr

#7. Mathematically torque is expressed by

T = j x P

T = r . P

T = r x F

T = r . F

#8. The direction of torque T = r x F is found by

knowing the direction of f

knowing the direction of r

left hand rule

right hand rule

#9. The rate of change of angular momentum of a body is equal to

moment of inertia

the applied torque

applied force

impulsive force

#10. If G becomes four times, then ‘g’ will become

4 g

zero

3 g

2 g

#11. Below the surface of earth, the value of g

increases

decreases

remains constant

becomes zero

#12. The unit of Planck’s constant in C.G.S system of units is

Joules/sec

Joules-sec

Erg-sec

Sec/Joules

#13. Velocity of sound in air is

Directly proportional to the square root of absolute temperature

Inversely proportional to the square root of absolute temperature

Directly proportional to absolute temperature

Inversely proportional to absolute temperature

#14. In Young’s Double Slit experiment, interference fringes are produced by using green light. To increase the separation of the fringes:

Increasing the width of each slit

Decreasing the distance between the slits and screen

Replacing the light source with a monochromatic of red light

Increasing the distance between the two slits

#15. In Young’s Double Slit experiment, the position of mth dark fringe on the screen from center is given by:

(m)d/Lλ

(m+1/2)Lλ/d

(m-1/2)Lλ/d

m(Lλ/d)

#16. Which one of the following properties prove the transverse nature of light?

polarization

refraction

interference

diffraction

#17. A refracting substance bounded by one or two spherical surfaces is called

Glass

Prism

Mirror

Lens

#18. A lens which converges a parallel beam of light to a single point is called

Plano-concave lens

Convex lens

Concave lens

Double convex lens

#19. If the size of the image of a 10 mm high object is 2 cm, then magnification produced by the lens is

#20. If the reading on Fahrenheit scale is double of its numerical value on the centigrade scale, then that reading on centigrade scale will be

40°

320°

160°

80°

#21. Entropy of universe during any natural process

Increases

Decreases

Remains constant

None of these

#22. Fifteen hundred calories are added to 100 grams of gold when its temperature is 20°C. The resulting temperature of gold will be (specific heat of gold is 0.03)

320° C

520° C

120° C

50° C

#23. Heat energy added to a system under isothermal conditions appears as

Increases in temperature

Work done by the system

Work done on the system

Increase in internal energy

#24. Charles law states that the volume of a given mass of a gas is directly proportional to

Inversely proportional to pressure

Directly proportional to pressure

Directly proportional to absolute temperature

None of these

#25. The Fahrenheit and Kelvin scales will have the same reading when temperature is

287.12

71.78

574.25

143.56

#26. Capacitors and capacitance 2μF, 3μF and 4μF are connected in series. The equivalent capacitance will be

Less than 2μF

Zero

Equal to 2μF

Greater than 2μF

#27. Potential difference between two points in an electric field is the definition of

An electric flux

A current

An electric field intensity

A voltage

#28. The force of attraction between two oppositely charged bodies is proportional to

The product of the charges

The distance between them

Magnitude of positive charge

Magnitude of negative charge

#29. A battery of 6 volts is short circuited by a copper wire. What will be the potential difference across its terminals

0 volts

2 volts

6 volts

4 volts

#30. The filament of lighted bulb obeys

None of the following

Ohm law

Faraday's law

Coulombs law

#31. The resistance of wire of length L is 8 Ω. What fraction of its length must be increased to increase its resistance four times

L/2

4 L

2 L

L / 4

#32. What is the current in a 2 x 10^6 ohm resistors having a potential difference of 2 x 10^3 volts?

10^-4 A

1 mA

10^-3 A

10^-5 A

#33. The phenomenon in which a change of current in one coil produces an induced emf in another coil nearly is called

Mutual induction

Mutual inductance

Self induction

Self inductance

#34. What does happen to an electron in a conductor if an alternating current is allowed to flow through it

It oscillation about its means position

It moves perpendicular to the conductor

It remains at rest

It moves along the conductor

#35. Frequency of AC used in Pakistan is

50 cycle / sec

40 cycle / sec

100 cycle / sec

60 cycle / sec

#36. The relation between Tesla and Gauss is

1 T = 10^4 G

1 T = 10^2 G

1 T = 10^-4 G

1 T = 10 G

#37. When a wire of length 3 cm is moved with a velocity of 2 m/s perpendicularly in a magnetic field of strength 10 tesla then the e.m.f induced is

0.8 V

0.4 V

0.2 V

0.6 V

#38. To measure current through a circuit, an ammeter is connected in

Parallel

Series

Either parallel or series

None of them

#39. The working of galvanometer depends upon torque exerted on a current carrying coil placed in a

Magnetic field

Nuclear field

Electric field

Gravitational field

#40. The second law of thermodynamics is concerned with the situation in which

heat can be converted into work

direction of flow of heat

both A & B

none of these

#41. The percentage efficiency of Carnot’s engine is given by

η = (1 - T1/T2) x 100%

η = (1 + T2/T1) x 100%

η = (1 + T1/T2) x 100%

η = (1 - T2/T1) x 100%

#42. The unit of thermodynamic temperature scale is

Celsius

Fahrenheit

kelvin

all of these

#43. Physics is one of the branches of

Life sciences

Physical sciences

Biological sciences

Social sciences

#44. Which expression represents a NAND operation?

X = AB + AB

X = A + B

X = NOT(A . B)

#45. A common point between OR and AND gates is that

their outputs may be 1 even when either of their inputs is 1

their outputs are 1 when all inputs are at 1

their outputs may be 1 even when either of their inputs is 0

none of these

#46. The production of electrons in a cathode-ray tube is

from a radioactive source

by ionization of the air

by applying an electric field to the X-plates

by heating the filament

#47. A sinusoidal trace is observed on a CRO screen. For this alternating potential was given to

The anode

The cathode

The filament

The Y-plates

#48. If a charge Q is dispersed over two spheres of radii R and r such that their surface charge densities are equal. What is the ratio of their charges

R^2 / r^2

R / r

r / R

r^2 / R^2

#49. Transformer works on

A.C only

D.C only

both A.C and D.C

None of these

#50. What will be the maximum velocity of 1 kg mass attached to a spring of constant K

2π √(K/m)

1/2π √(m/K)

xo √(K/m)

2π √(m/K)

Finish

Results

#1. A vector having magnitude equal to given vector but in opposite direction is called

#2. If A = 3i + 6j, B = xi + k and A.B = 12, then x will be equal to

#3. When two equal and opposite vectors are added, then their resultant will have

#4. In SI system of units, the velocity is measured in

#5. A ball is thrown vertically upward with an initial velocity of 49 m/s. The maximum height it will reach will be

#6. The terminal velocity of a rain droplet of mass m and radius r is

#7. Mathematically torque is expressed by

#8. The direction of torque T = r x F is found by

#9. The rate of change of angular momentum of a body is equal to

#10. If G becomes four times, then ‘g’ will become

#11. Below the surface of earth, the value of g

#12. The unit of Planck’s constant in C.G.S system of units is

#13. Velocity of sound in air is

#14. In Young’s Double Slit experiment, interference fringes are produced by using green light. To increase the separation of the fringes:

#15. In Young’s Double Slit experiment, the position of mth dark fringe on the screen from center is given by:

#16. Which one of the following properties prove the transverse nature of light?

#17. A refracting substance bounded by one or two spherical surfaces is called

#18. A lens which converges a parallel beam of light to a single point is called

#19. If the size of the image of a 10 mm high object is 2 cm, then magnification produced by the lens is

#20. If the reading on Fahrenheit scale is double of its numerical value on the centigrade scale, then that reading on centigrade scale will be

#21. Entropy of universe during any natural process

#22. Fifteen hundred calories are added to 100 grams of gold when its temperature is 20°C. The resulting temperature of gold will be (specific heat of gold is 0.03)

#23. Heat energy added to a system under isothermal conditions appears as

#24. Charles law states that the volume of a given mass of a gas is directly proportional to

#25. The Fahrenheit and Kelvin scales will have the same reading when temperature is

#26. Capacitors and capacitance 2μF, 3μF and 4μF are connected in series. The equivalent capacitance will be

#27. Potential difference between two points in an electric field is the definition of

#28. The force of attraction between two oppositely charged bodies is proportional to

#29. A battery of 6 volts is short circuited by a copper wire. What will be the potential difference across its terminals

#30. The filament of lighted bulb obeys

#31. The resistance of wire of length L is 8 Ω. What fraction of its length must be increased to increase its resistance four times

#32. What is the current in a 2 x 10^6 ohm resistors having a potential difference of 2 x 10^3 volts?

#33. The phenomenon in which a change of current in one coil produces an induced emf in another coil nearly is called

#34. What does happen to an electron in a conductor if an alternating current is allowed to flow through it

#35. Frequency of AC used in Pakistan is

#36. The relation between Tesla and Gauss is

#37. When a wire of length 3 cm is moved with a velocity of 2 m/s perpendicularly in a magnetic field of strength 10 tesla then the e.m.f induced is

#38. To measure current through a circuit, an ammeter is connected in

#39. The working of galvanometer depends upon torque exerted on a current carrying coil placed in a

#40. The second law of thermodynamics is concerned with the situation in which

#41. The percentage efficiency of Carnot’s engine is given by

#42. The unit of thermodynamic temperature scale is

#43. Physics is one of the branches of

#44. Which expression represents a NAND operation?

#45. A common point between OR and AND gates is that

#46. The production of electrons in a cathode-ray tube is

#47. A sinusoidal trace is observed on a CRO screen. For this alternating potential was given to

#48. If a charge Q is dispersed over two spheres of radii R and r such that their surface charge densities are equal. What is the ratio of their charges

#49. Transformer works on

#50. What will be the maximum velocity of 1 kg mass attached to a spring of constant K

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