Question # 1

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

The center of mass of a sphere lies at:

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The axis of the sphere

Circumference of sphere

Center of the sphere

None of them

Which one of the following elasticizes is possessed by fluids:

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Young's elastic modulus (length)

Bulk elastic modulus (volume)

Modulus of rigidity (shape)

None of these

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

The size of the domain is such that they can contain

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10²to 10⁴atoms

10⁴ to 10⁸atoms

10⁸to 10¹²atoms

10¹²to 10¹⁶atoms

In photoelectric effect the energy of ejected electrons depend on

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The frequency

The intensity

Both frequency and intensity

None of these

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

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

Bats navigate and find food by:

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Ultrasonic

Echolocation

Refraction

In an astronomical telescope is the objective has the focal length f_o is

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Small

Very small

Long

None of these

In crystalline solids, atoms are held about their equilibrium positions depending upon the strength of:

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Adhesive forces

Nuclear forces

Inter atomic cohesive force

Electromagnetic force

None of these

The fringes produced in Young's double slit experiment will be wider if the distance between the two slits is

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small

large

zero

very large

Direction of torque can be found out by

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head to tail rule

parallelogram rule

left hand rule

right hand rule

Two bodies with masses M_A and M_b are moving with equal kinetic energy.Their linear momenta are numerically in a ratio

|P_A| : |P_b| will be:

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M_b : M_A

M_A : M_b

√M_A : √M_b

M²_A : M²_B

The stress which increase the length in one dimension only is called

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length stress

only have compressive stress

Have both tensile and compression stress

None of them

Bulk modulus for aluminium is

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40

70

75

95

The value of solar constant in SI system is

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1340 watt/m²

1340 m²/watt

1340 watt/m

After elastic limit the shape of graph is

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Curved

Straight Line

Saw tooth

Arbitrary

Most motorbikes have ____________ cylinder/s engine but cars usually have _________ cylinders on the same crankshaft.

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Four , Six

One , four

two , five

None of these

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