PHYSICS TEST 10 - PAK ARMED FORCES TEST

Results

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QUIZ START

#1. The dimension of Planck’s constant are same as that of

Power

Angular momentum

Energy

Angular frequency

#2. The prefix nano stands for

10^-19

10^19

10^-9

10^9

#3. which one of the following is not a unit of length.

Radian

Light year

Angstrom

Micron

#4. What is the scalar product of two vectors A and B making an angle θ with each other?

AB cos θ

AB tan θ

AB sin θ

#5. If A and B are parallel then

A.B = -AB

A.B = 0

A.B = AB

A.B = 1

#6. A force of 20 N is acting along x-axis. Its component along x-axis

Zero

20 N

5 N

10 N

#7. The unit of weight in SI units is

Newton

Pound

Dyne

Slug

#8. If ΔV is the change in velocity of a body during time internal Δt then the acceleration of the body is

ΔV - Δt

ΔV / Δt

(Δt)(ΔV)

Δt / ΔV

#9. The stokes law expresses the drag force on a spherical body of radius r moving with velocity v in a viscous medium as

6πηv / r

6π ηrv

ηrv / 6

6πrv / η

#10. Work done by centripetal force is

Negative

Positive

Zero

Maximum

#11. When a person throws a stone vertically upward while sitting in a train moving with constant velocity the stone will fall

Beside him

In his hand

Behind him

In front of him

#12. Linear acceleration of point moving in a circle of radius 30 cm with angular acceleration of 0.5 rad/sec^2 is

20 cm/sec^2

15 cm/sec^2

10 cm/sec^2

5 cm/sec^2

#13. Angular momentum L is expressed by the equation

r x P

r ^ t

m v

r x F

#14. When direction of both r and F are reversed then

Direction of torque changes

Magnitude of torque changes

Torque does not change

Torque changes

#15. Law of conservation of angular momentum states, that in the absence of an external torque, the angular momentum of a rotating body is

Zero

Unstable

Constant

Variable

#16. At a distance equal to the radius of the earth above the surface of earth, the value of g becomes

Negative

Half

One fourth

Zero

#17. If distance between two bodies is doubled and their masses are also doubled the gravitational force will

Remain Constant

None of these

Increase four times

Decrease four times

#18. If two massed 1 Kg and 10 kg are 1 m apart then acceleration of

10 kg is greater than 1 kg

Both masses are same

Both masses are zero

1 kg is greater than 10 kg

#19. The minimum Initial velocity required to take a body out of earth gravitational field is known as

Angular Velocity

Escapvelocity

Variable Velocity

Instantaneous Velocity

#20. In British Engineering System of units, one horse power is equal to

750 watts

742 watts

754 watts

746 watts

#21. The unit of work in S.I system of units is

Joule

Erg

Foot-pound

Watt

#22. The distance between a compression and an adjacent rarefaction of compressional wave is 1 cm, and the wave speed of the wave is 2 cm/sec then its wave length is

1 cm

2 cm

4 cm

3 mc

#23. In young’s Double Slit experiment, the distance between two consecutive bright or dark fringes is

Lλ / d

L / dλ

d / Lλ

dλ / L

#24. Polaroid’s can be used

All of the following

In curtain less window to adjust the amount of light

To control head light glare in night driving

To determine the concentration of optically active substance

#25. An object with height 2 cm is placed at a distance of 8 cm from the lens having focal length 6 cm. What will be the distance of the image from the lens

32 cm

24 cm

16 cm

8 cm

#26. An object is placed between the focus and the optical centers of the convex lens. The image formed is

Virtual, errect, and diminished

Real, errect and magnified

Virtual, errect and magnified

Real, inverted and magnified

#27. The least distance of distinct vision for normal eye is

25 cm

20 cm

10 cm

15 cm

#28. For a gas obeying Charle’s law, if the temperature is doubled then its volume becomes

Remains constant

Three fold

Double

Half

#29. Which one of the following possesses maximum specific heat

Water

Cedar oil

Milk

Turpentine oil

#30. A pendulum of a clock made of steel keeps correct time because its

Volume expansion is large

Linear expansion is very small

Linear expansion is large

Volume expansion is small

#31. A capacitor of value 4 microfarad is charged to a voltage of 12 volts, what is the charge on its plates

1/4.8 x 10^-5 coul

1/3 x 10^-6 coul

3 x 10^-6 coul

4.8 x 10^-5 coul

#32. An electric volt is a unit of

Energy

Power

Potential

Charge

#33. The electric flux is defined as

Product of distance of charge and area

Product of charge generating field and area

Scalar product of electric field intensity and area

product of force and area

#34. If we plot a graph between potential difference (v) and current (I) in Ohm’s law, it will give is

Straight line

Ellipse

Parabola

Hyperbola

#35. Resistance of a semi conductor

Reduces to zero with increase of temperature

Remains constant with increase of temperature

Increases with increase of temperature

Decreases with increase of temperature

#36. In a parallel combination of resistors the equivalent resistance will be

Equal to the smallest resistance in parallel

Smaller than the smallest resistance in parallel

Larger than the largest resistance in parallel

Equal to the largest resistance in parallel

#37. If a certain transformer having 200 turns in its primary coil converts 11000 voltage to 220 volts for domestic purpose then the number of turns in secondary coil should be

#38. A particle of charge ‘q’ and mass ‘m’ moving with a velocity ‘v’ enters perpendicularly in a uniform magnetic field ‘B’ describes a circular path. What will be the radius of that path?

mvB / q

mqB / v

mqv / b

mv / Bq

#39. The equation for ampere law is

μ0 I = B^2 π r^2

μ0 I = B π r^2

μ0 I = B 2 π r

μ0 I = B π r

#40. A galvanometer gives full scale deflection with 100 volts if the resistance of galvanometer is 50Ω. The maximum current that can flow through it safely is

16 Amp

8 Amp

4 Amp

2 Amp

#41. Post office box is a special form of

Galvanometer

Whetstone bridge

Voltmeter

Ammeter

#42. Whetstone bridge will be balanced if

Potential difference across galvanometer is maximum

Maximum current flows through galvanometer

Minimum current flows through galvanometer

#43. In amplitude modulation, the waves superimposed on electromagnetic waves are

Matter waves

Light waves

Sound waves

Water waves

#44. A semi-conductor diode conducts only when it is

Forward biased

Not biased

Reverse biased

None of them

#45. Germanium (Ge) can be converted into P-type substance by doping with a

Pentavalent element

Tetravalent element

Trivalent element

Divalent element

#46. Which one of the following describes a relation for Compton wave length?

λc = h / m0 c

λc = m0 c / h

λc = hc / m0

λc = m0 h / c

#47. The minimum energy required to create electron position pair is

0.51 Mev

1.025 Mev

1.022 Mev

1.02 Mev

Finish