Question # 1

The weight 'mg' of the bob is resolved into

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one component

two components

three components

four components

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Flight of rocket in the space is an example of

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Newton's first law

Newton's third law

Newton's second law

all of them

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

The photoelectric effect, the maximum energy of photoelectrons depends on the

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particular metal surface

frequency of incident light

both of them

none of them

According to Einstein, with the great increase in the speed of the body, the relativistic mass of the body

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Remains constant

Decreases

Increases to infinity

Reduced to zero

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

The ability of the body to return to its original shape is called

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deformation

stretching

compressing

elasticity

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

The equations for uniformly accelerated motion for body moving at

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Acceleration

Constant acceleration

Instantaneous acceleration

None of these

A fly wheel of moment of inertia 500 kgm² is rotating at a angular speed of 6 rad s^-1. What torque is need to stop the wheel in 3 sec ?

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500 Nm

100 Nm

1500 Nm

2000 Nm

Inverse square law for luminance is valid for

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Search light

Isotropic point source

Cylindrical source

All types of sources

Collision between gas molecules are perfectly elastic when collide with

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Walls of container

Themselves

Both

None of these

The mks unit of Mechanical Equivalent of heat is

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Joulex calorie

Joule/ calorie

Calorie x erg

erg/ calorie

A body will be in translational equilibrium, if

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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

A cyclist bends while taking a turn to:

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Reduce friction

Generate required centripetal force

Reduce apparent weight

Reduce speed

In 420 days, the activity of a sample of polonium (Po) fell to one-eight of its initial value. The half-life of polonium is :

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140days

45days

87days

90days

In the absence of any force acting on a body

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its momentum changes with distance

its momentum is conserved

its momentum is not conserved

its momentum changes with time

In case of YDS experiment, the distance of the mth bright fringe on the screen from center is

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Y = (m + 1)λL/d

Y = mλL/d

Y = (m + 1/2)λL/d

None of these

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