Question # 1

The electric flux through any surface depends upon:

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Intensity of electric field

Area of the surface

Angle between intensity and area

All of these

None of these

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both (A) and (B)

The velocity of sound in air depends upon

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Density and elasticity of gas

Pressure

Wavelength

Amplitude and frequency of sound

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Max plank founded a mathematical model resulting in an equation that describes the shape of observed black body radiation curves exactly, in

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1890

1895

1900

1905

0.1 kg mass will be equivalent to the energy

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9 x 10¹⁵J

5 x 10⁸J

6 x 10¹⁶J

9 x 10^-16J

A choke coil is used as a resistance in

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d.c. circuit

a.c. circuit

d.c. potentiometer circuit

wheatstone bridge

When the shear stress and shear stain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The volume of a gas will be double of what it is at 0°C (pressure remaining constant) at

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546 K

273 K

546°C

273°C

During the upward motion of the projectile, the vertical component of velocity:

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Decreases

Increases

Remains constant

None of these

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

A man is an elevator descending with acceleration will conclude his weight has

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Increase

Decrease

Remain constant

Become zero

A ray of light reflected from a dense medium under goes a phase change of:

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30°

60°

90°

180°

The Earth's potential is considered to be at

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Zero

Minimum

Maximum

Infinite

For single slit diffraction the first minimum occurs when

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dsinθ = λ

dsinθ = λ/2

dsinθ = 2λ

dsinθ = mλ

The dimensions of expression V_f = V_i + at. Taking the R.H.S

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[LT]

[LT²]

[LT^-1]

[LT^-2]

When the lift is falling freely under gravity, then

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T = W - mg

T - W = ma

T = 0

None of these

Which optical fibre is used for shorter distances only?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

all of them

The concentration of red blood cells in blood is

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~ 30%

~ 40%

~ 45%

~ 50%

A non-conducting semiconductor diode is:

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Forward biased

Poorly biased

Reverse biased

None of them

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

Energy stored in a capacitor is

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E = 1/2 C²V²

E = 1/2 C^-1V²

E = 1/2 CV²

E = C²V²

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