PHYSICS TEST 2 - PAK ARMED FORCES TEST

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#1. Which of the following is not the unit of time?

Leap year

Lunar month

Solar day

Parallactic second

#2. One micron is equivalent to

10^-4 m

10^-6 m

10^4 m

10^6 m

#3. The mass of electron in Me V is

1.02 MeV/C^2

0.51 MeV/C^2

51 MeV/C^2

102 MeV/C^2

#4. The ratio of nuclear magneton and Bohr magneton is

m_e/m_p

m_p/m_e

m_e/m_p

2m_p/m_e

#5. The value of Faraday number in SI unit is

9.65 Coulomb/kg/equivalent

9.65 x 10^7 Coulomb/kg/equivalent

9.65 x 10^7 Coulomb/kg / equivalent

9.65 coulomb/kg/equivalent

#6. The velocity of ripples on water surface depends upon the wavelength λ , density of water d and acceleration due to gravity g. Which of the following relation is correct among these quantities?

V^2 ∝ agλ

V^2 ∝ alg / λ

V^2 ∝ aλ/gd

V^2 ∝ agλd

#7. The fundamental unit of the quantity of matter is

Mol

Meter

#8. Relation between range and maximum range is

R=R_max Sinθ

R = R_max Sinθ/2

R = R_max Sin2θ

R_max = RSin2θ

#9. In an inelastic collision

both K.E and momentum are conserved

both K.E and momentum are not conserved

momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

#10. Viscosity of air is

0.019×10^-3 Nsm^-2

0.019×10^-3 N - sm^-2

0.0019×10^-3 N – sm^-2

0.0019×10^-3 Nsm^-2

#11. The viscosity of water is

0.019×10^-3 Nsm^-2

0.801×10^-3 N - sm^-2

6.29×10^-3 N – sm^-2

0.081×10^-3 N – sm^-2

#12. For the steady flow of incompressible fluid, the equation of continuity is given by

A_1V_1 = A_2V_2

A_1/V_1 = A_2/V_2 V

V_1/A_1 = V_2/A_2

A_1V_1T_1 = A_2V_2T_2

#13. The viscosity of glycerine is

0.019×10^-9 Nsm^-2

0.801×10^-6 Nsm^-2

6.29×10^-3 N – sm^-2

6.29×10^3 Nsm^-2

#14. For a point source of light the wave front produced are

circular

spherical

cylindrical

none

#15. In thin film Colours are due to

reflection

interference

diffraction

refraction

#16. Bending of light around sharp edges is known as

interference

diffraction

reflection

dispersion

#17. Michelson interferometer is based upon

interference

diffraction

polarization

reflection

#18. The wave length of X-rays is of the order of

10^-17 m

10^-4 cm

10^-9 m

10^-10 m

#19. A particle is moving such that its acceleration is represented by the equation a= – bx, where x is its displacement from mean position and b is a constant

2π/√b

2π/b

2π√b

2√(π/b)

#20. n-type Germanium is obtained on doping intrinsic Germanium by

Phosphorous

Aluminium

Boron

Gold

#21. A simple pendulum is released when θ = π /6. the time period of oscillation is

5π √(l/g)

2π √(l/g (293/288))

2π √(l/g (288/293))

None of these

#22. If identical springs of spring constant K are connected in series and then parallel combinations. A mass m is suspended from them. The ratio of their frequencies for vertical oscillations will be

5 : 4

1 : 2

4 : 1

9 : 2

#23. The maximum displacement of a particle executing SHM from its mean position is 2 cm and its time period is 1 s. the equation of its displacement will be

x = 2 sin 4πt

x = 2 sin 2πt

x = sin 2πt

x = 9 sin 2πt

#24. The dimension of elastic modulus

ML^-1T^-2

MLT^-2

ML^-1T^2

MT^-3

#25. Solids having partially field conduction bands are

insulator

semiconductor

super conductor

semi insulator

#26. Domains are present only in

diamagnetic material

para magnetic material

ferromagnetic material

all of these

#27. At what temperature does the mean kinetic energy of hydrogen atoms increase to such an extent that they will escape out of the gravitational field of earth forever?

10075°K

18000°K

14075°K

22000°K

#28. An astronaut carries with him a cylinder of capacity 10 litre filled with nitrogen gas at temperature 27°C and pressure 50 atmosphere. He makes hole of area 1 cm^2 in it. In how much time will it be emitted?

755 s

1.132 s

0.153 s

0.387 s

#29. The energy released in fission reaction is

Tidal energy

Solar energy

Wind energy

Nuclear energy

#30. Which of the following pairs represent units of the same physical quantity?

Kelvin and joule

Kelvin and calorie

Newton and calorie

Joule and calorie

#31. The ratio of specific heat capacity to molar heat capacity of a body

is a universal constant

depends on the mass of the body

depends on the molecular weight of the body

is dimensionless

#32. The colour of light emitted by a LED depends on

Its forward bias

its reverse bias

The type of semi-conductor material used

the amount of forward current

#33. A diode characteristic curve is a plot between

Current and resistance

voltage and time

Voltage and current

Forward voltage and reverse voltage

#34. Breakdown voltage in a p-n diode is

-25V

25 V

45 V

9 V

#35. If current “I” flows steadily through a resistor “R” for time “t” then heat energy supplied to the system can be defined as

Power/Time

Power x applied voltage

Power x time

none of the above

#36. In case of generator

Chemical energy into electric energy

Mechanical energy into e.m.f.

Mechanical energy into electrical energy

None of the above

#37. A d.c. Voltage supply has an internal resistance of r Ω. A resistive load R is connected across the terminals of the supply. The power developed in R is maximum when R (in ohm) is

√r

√2r

#38. Eddy currents do not cause

Damping

Heating

Sparking

Loss of energy

#39. Energy stored per unit volume inside a long solenoid is known as

Energy density

power density

energy

surface charge density

#40. Slip rings are used in

Electric motor

D.C Dynamo

A.C. generator

None of them

#41. X-rays are affected by

electric field

magnetic field

both a & b

none of these

#42. Balmer series lies in

ultraviolet region

infrared

visible

all

#43. In energy level diagram horizontal lines show

energy levels

emission of photons

wavelength of photon

all

#44. The concentration of Neon in He-Ne laser is

15%

40%

85%

90%

#45. SI unit of decay constant

N.s

s^-1

#46. Quenching gas in Geiger Counter

#47. Solid state detector are used in ________ mode

forward bias

reverse bias

without bias

in sun light

#48. In a nuclear reaction, which conservation law holds:

conservation of mass

conservation of energy

conservation of charge

all are correct

#49. Pick out the INCORRECT statement

force, [MLT^-2]

energy, [ML^2T^-2]

power, [ML^2T^-3]

density, [ML^3T^-1]

#50. Dimension of impulse is same as that of

force

torque

momentum

angular momentum

Finish