Question # 1

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:

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Not affected due to its size

Twice that of small size ball

Four times that of small size ball

1/4th of that of small size ball

The frequency of free vibrations is known as

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free frequency

forced frequency

natural frequency

un-natural frequency

The phenomenon of generation of induced emf is called:

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Electrostatic induced

Magnetic induced

Electromagnetic induced

Electric induced

Both A and C

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

A person starts his journey from a point 0, travels 4 Km SW, then 4 Km NW, and finally 4 Km north-east. At what distance is he now from point 0?

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0 Km

4 Km

8 Km

12 Km

A body walks to his school at a distance of 6 km with a speed of 2.5 km/h and walks back with a constant speed of 5 km/h. His average speed for round trip expressed in km/h is

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24/13

10/3

3

4,8

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

A body moving with an acceleration of 5 m/sec²started with velocity of 10 m/sec. What will be the distance traversed in 10 seconds?

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150 m

250 m

350 m

400 m

One radian is

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Greater than one degree

Less than one degree

Equal to one degree

None of these

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

a constant force F is applied to keep the particle moving with uniform velocity V.Then the power required is

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1/2 FV²

FV²

FV

F/V

The magnifying power of a compound microscope can be increased if we use objective lens of

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Large focal length

Small focal length

Same focal length

None of these

Just before setting the sun may appear to be elliptical This happens due to

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Diffraction

Reflection

Dispersion

Refraction

The energy density for capacitor is

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1/2 ∈_oE²

1/2 ∈_rE²

1/2 ∈_r∈_oE²

1/2 ∈_o∈_rE

The working of carburetor of a car uses

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Gravitational law

Equation of continuity

Bernoulli's theorem

Stock's law

Equal vectors are said to be equal if by have

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Same magnitude and direction

Same magnitude and opposite

No position of initial points

Direction a and b

In 1986 a new class of ceramic material was discovered at temperature as high as

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19 K

78 K

108 K

12 K

The wave nature of light was first proposed by

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Huygen

Thomas Young

Newton

Compton

The SI unit of torque is

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Nm^-1

Nm^-2

Ncm

Nm

The effect is to increase the inflation the bag is

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To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

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