Question # 1

The direction of the angular velocity vector is along

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The tangent to the circular path

The inward radius

The outward radius

The axis of rotation

When a body movies in a circle in the counter clockwise direction the angular displacement Δθ is taken as

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Positive

Negative

Both ways

None of these

The size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

The approximate efficiency of incandescent lamp is

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6%

8%

5%

9%

The rectangular components of force 5 dyne are

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3 and 4 dyne

2.5 and 25 dyne

1 and 2 dyne

2 and 3 dyne

Fringe spacing in YDS experiment will be maximum if we use:

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Red light

Green light

Violet light

Blue light

What is the magnitude of a point charge which produces an electric field of 2 N/C at a distance of 60 cm)?

(1/4πε_∘ = 9 x 10⁹ Nm²/C²)

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8 x 10^-11 coulomb

2 x 10^-12 coulomb

3 x 10^-11 coulomb

6 x 10^-10 coulomb

The communication with any place on the surface of the Earth can be made by the wave/rays known as

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Infrared

Microwave

X-rays

Radio waves

The relation Cp > Cv by an amount equal to

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Gas constant

Universal gas constant

Both

None of these

The disadvantage of the step-index fibre can be reduced by

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graded index fibre

non-graded index fibre

both of these

none of these

Viscosity of glycerin at 30^oC in Nsm^-2

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

Which of the following theory completely explain the three types of materials?

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory

High energy physics is the physics of

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Nucleus

Subatomic particles

Plasma physics

Astrophysics

Analyzer is use to

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Polarize the light

Un-polarize the light

Check whether the light is polarized or un polarized

Rotate the plane of polarized light

Angular acceleration is a

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Scalar quanity

Variable quantity

Vector quantity

None of these

Volume of metal cylinder with the help of a vernier callipers of least count 0.01 cm when diameter is 1.22 cm and length 5.35 cm. Find its uncertainty as

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6.02 ± 0.1 cm³

6.2 ± 0.1 cm³

6.25 ± 0.1 cm²

6.3 ± 0.1 cm³

What is the unit of the Young's modulus?

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N m^-2

N m^-1

N m

N m²

When the temperature difference between the source and the the sink increases, the efficiency of the heat engine will

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Increase

Decrease

Is not affected

May increase or decrease depending upon the nature of the working substance

The mass of electrons in Me V is

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1.02 Mev/C²

0.51 Mev/C²

51 Mev/C²

102 Mev/C²

Ferromagnetic substances lose their magnetism when heated above a certain temperature, known as

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critical temperature

curie temperature

high temperature

fixed temperature

When a constant force is applied on a body it moves with uniform

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Acceleration

Velocity

Speed

Momentum

The field in which the work done be independent of the path followed is called

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Conservative fields

Non-conservative field

Varying intensity field

None of these

Blood is an incompressible fluid having density nearly equal to

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Milk

Honey

Water

None of these

The pattern of a crystalline solid is:

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One dimensional

Two dimensional

Three dimensional

Either A or B

None of these

The difference between two separated positions are given as X₁ = 10.5 ± 0.1 cm and X₂ = 26.8 ± 0.1 cm. What is their absolute uncertainty

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1.63 ± 0.1 cm

16.3 ± 0.2 cm

3 ± 0.1 cm

16.3 ± 0.05 cm

In an inkjet printer, the toner drops are

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Charged

Not charged

Charged and deflected

None of these

Wavelength of the wave is the distance between the particles of the medium having adifference of:

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Zero

n

2n

𝜋2

Shear modulus for tungsten is

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50

100

150

200

The dimensions of torque is

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[MLT^-2]

[ML²T^-2]

[ML²T^-1]

[MLT]

When first condition of equilibrium is satisfied the body has

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no linear acceleration

no angular acceleration

rational equilibrium

none of them

Which of the following is not a projectile?

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a bullet fired from a gun

a spaceship

a football in air

an artillery shell

The law of conservation is important in many sport like

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Diving

Gymnastics

Ice-skating

All of these

The magnetic fields are produced by the

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Moving charges

Bar magnets

Motion of conductor in a magnetic field

All of them

A car travels first half distance between two places with a speed of 30 km/h and remaining half with a speed of 50 km/h.The average speed of the car is

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37.5 km/h

10 km/h

42 km/h

40 km/h

Super conductors are materials like

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Alloys

Ceramic

Semiconductors

a and b

In an interference pattern of Young,s Double Slit (YDS) experiment

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Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equally spaced

Central fringes are wider than the outer fringes

Angular displacement is a vector quantity for

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Small value of Δθ

Very small value of Δθ

All values of Δθ

None of these

Propagation of light in an optical fibre requires

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Total internal reflection

Continuous refraction

Both

None of these

What are the base units of Planks constant h Remember the energy of a photon is given by hf where f element the frequency

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kgms^-1

kgm²s^-1

kgm²s^-2

kgm²s^-3

Which of the following is conserved when light waves interfere

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Intensity

Energy

Amplitude

Momentum

Can you add zero to a null vector ?

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No

Yes

Yes in some cases

None of these

The waves propagate in space by the motion of the

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wavelengths

frequencies

wavefronts

none of them