PHYSICS TEST 3 - PAK ARMED FORCES TEST

Results

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QUIZ START

#1. In an experiment to determine acceleration due to gravity by simple pendulum, a student commits 1% positive error in the measurement of length and 3% negative error in the measurement of time period. The percentage error in the values of g will be

10%

#2. The dimensions of the coefficient of viscosity are

[ML^-1T^-1]

[MLT]

[M^-1L^-1T^-1]

[M^0L^0T^0]

#3. If the error in the measurement radius of a sphere is 1 %, then the error in the measurement of volume will be

#4. The ratio of the atomic radius to nuclear radius is

10^4

10^-4

10^2

10^-2

#5. One fermi is equivalent to

10^-14 meter

10^14 meter

10^-15 meter

10^15 meter

#6. Debye is the unit of

magnetic dipole moment

electric dipole moment

density

RMS velocity

#7. The units of the temperature coefficient of resistant are

ΩK^-1

K^-1

ΩK

(ΩK)^-1

#8. Force due to water flow is

ma/t

mv/t

m/t

mt/v

#9. Trajectory of projectile is

ellipse

hyperbola

parabola

none of these

#10. The spherical object will have the terminal velocity

V_t = 2gr^2ρ / 9η

V_t = MG / 4πηr

V_t = mg / 6πηr

None of these

#11. The centre of gravity of an object is

the point at which the gravity not acts

the point at which the total torque is minimum

the geometrical centre of the body

the point at which the weight of the object seems to act

#12. An object moving with acceleration g is said to fall freely. Identify freely falling objects from the list given below

An orange falling from a tree

A satellite orbiting around the Earth

A football kicked in the air

All of these

#13. The two forces of a couple do not follow the rule that

they act on the same angle

they act in the opposite directions

they have same directions

they cancel out each other

#14. Sky seems Blue due to

Diffraction

polarization

Dispersion

scattering

#15. According to Young’s experiment the distance between two adjacent bright fringes of blue light is than for orange light

less

maximum

equal

may be less may be greater depending upon slit spacing

#16. Who gave the corpuscular nature of light?

Einstein

Newton

Maxwell

Thomas young

#17. We can use Fibre optics system for

Image transmitting

Word processing

Image processing and receiving

All

#18. There will be no change in ______ of Light entering glass

velocity

frequency

direction

wavelength

#19. The curve between acceleration and velocity of a particle executing SHM is a an

ellipse

circle

parabola

none

#20. On increasing the length of a second’s pendulum by Z% its time period will

increase by 2 Z%

decrease by Z%

decrease by 2 Z%

increase by 0.5 Z%

#21. The ratio of the P.E of a particle executing SHM when at extreme position its total energy is

=1/g

#22. The time period of a simple pendulum of infinite length is

T = 2π√(R_e/g)

infinity

T = π√(R_e/g)

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

2 g

3 g

4 g

Zero

#24. Material with smaller hysteresis loop area are best for the construction of

transformer

core of transformer

D.C motor

rectifier

#25. Which of the given strains can also be written as tanθ

compressional strain

volumetric strain

shear strain

all of these

#26. Reciprocal of bulk modulus is called

shear modulus

compressibility

young's modulus

none

#27. Consider the quantity MkT / pV of an ideal gas where M is the mass of the gas. It depends on the

temperature of the gas

volume of the gas

pressure of the gas

nature of the gas

#28. ______ is an irreversible process?

Rapid liquefactions

Explosion

Rapid compression of a gas

None

#29. In which stroke of petrol engine fuel is ignited?

First

fifth

Third

Fourth

#30. The following expression represent ΔU = -W

Isothermal expansion

Isobaric process

Adiabatic compression

None of these

#31. A gas performs the most work when it expands

Isothermally

Adiabatically

Isoberically

At a non uniform rate

#32. In forward bias, semiconductor diode acts as

Open switch

Closed switch

Rectifier

Amplifier

#33. In depletion region charge carriers are

Free electron

Holes

Both free electron and holes

Absent

#34. Basically transistor is

Current amplifier

Voltage amplifier

Power amplifier

All are correct

#35. If two conducting spheres of radii r1 and r2 are charged such that they have the same electric field on their surfaces. The ratio of the electric potential at their centres will be

√(r1/r2)

r1/r2

r1^2 / 5r2

All of these

#36. A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

11/3 A

3 A

3/11 A

#37. Battery is charged in motor cars, which is based on

Chemical effect

Magnetic effect

Electric effect

None

#38. The intensity of magnetization depends on magnetizing field. For its low value

I ∝ I/H

I ∝ H

I ∝ 1/H^2

I ∝ H^2

#39. A transformer

Transforms Energy

Doubled

Halved

Squared

#40. The armature current in a DC motor is maximum when the motor has

picked up maximum speed

Just started

in anticlockwise direction

infinite

#41. Diffraction of x-rays was first studied by

J.J. Thomson

B. Rutherford

C. Laue

D. Bragg

#42. Lasers are classified as

solid laser

gas laser

liquid

all of these

#43. De-Broglei’s wavelength is

λ = hv

λ = hp

λ = h / 2λ

λ = h / p

#44. The reciprocal of decay constant of a radioactive element is called its

Half life

Mean life

Total life

None of these

#45. In nuclear fission the energy released per fission is

100 Mev

200 Mev

300 Mev

400 Mev

#46. The binding energy per nucleon of U235 is

7 MeV

7.5 MeV

7.6 MeV

8 MeV

#47. The minimum mass of uranium required to start chain nuclear reaction is called

critical mass

minimum mass

controlled mass

chain mass

#48. Control rods in nuclear reaction consist of

Boron

Steel

Iron

Copper

#49. Laws of motion are valid in a frame which is

uniform motion

inertial

both a and b

none of these

#50. Under normal circumstances, the volume of the blood is sufficient to keep the vessels

inflated all the time

deflated all the time

contracted all the time

squeezed all the time

Finish

Results

#1. In an experiment to determine acceleration due to gravity by simple pendulum, a student commits 1% positive error in the measurement of length and 3% negative error in the measurement of time period. The percentage error in the values of g will be

#2. The dimensions of the coefficient of viscosity are

#3. If the error in the measurement radius of a sphere is 1 %, then the error in the measurement of volume will be

#4. The ratio of the atomic radius to nuclear radius is

#5. One fermi is equivalent to

#6. Debye is the unit of

#7. The units of the temperature coefficient of resistant are

#8. Force due to water flow is

#9. Trajectory of projectile is

#10. The spherical object will have the terminal velocity

#11. The centre of gravity of an object is

#12. An object moving with acceleration g is said to fall freely. Identify freely falling objects from the list given below

#13. The two forces of a couple do not follow the rule that

#14. Sky seems Blue due to

#15. According to Young’s experiment the distance between two adjacent bright fringes of blue light is than for orange light

#16. Who gave the corpuscular nature of light?

#17. We can use Fibre optics system for

#18. There will be no change in ______ of Light entering glass

#19. The curve between acceleration and velocity of a particle executing SHM is a an

#20. On increasing the length of a second’s pendulum by Z% its time period will

#21. The ratio of the P.E of a particle executing SHM when at extreme position its total energy is

#22. The time period of a simple pendulum of infinite length is

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

#24. Material with smaller hysteresis loop area are best for the construction of

#25. Which of the given strains can also be written as tanθ

#26. Reciprocal of bulk modulus is called

#27. Consider the quantity MkT / pV of an ideal gas where M is the mass of the gas. It depends on the

#28. ______ is an irreversible process?

#29. In which stroke of petrol engine fuel is ignited?

#30. The following expression represent ΔU = -W

#31. A gas performs the most work when it expands

#32. In forward bias, semiconductor diode acts as

#33. In depletion region charge carriers are

#34. Basically transistor is

#35. If two conducting spheres of radii r1 and r2 are charged such that they have the same electric field on their surfaces. The ratio of the electric potential at their centres will be

#36. A 60 W bulb operates on 220 V supply. The current flowing through the bulb is

#37. Battery is charged in motor cars, which is based on

#38. The intensity of magnetization depends on magnetizing field. For its low value

#39. A transformer

#40. The armature current in a DC motor is maximum when the motor has

#41. Diffraction of x-rays was first studied by

#42. Lasers are classified as

#43. De-Broglei’s wavelength is

#44. The reciprocal of decay constant of a radioactive element is called its

#45. In nuclear fission the energy released per fission is

#46. The binding energy per nucleon of U235 is

#47. The minimum mass of uranium required to start chain nuclear reaction is called

#48. Control rods in nuclear reaction consist of

#49. Laws of motion are valid in a frame which is

#50. Under normal circumstances, the volume of the blood is sufficient to keep the vessels

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