Question # 1

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

Angular velocity is a:

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Scalar quantity

Vector quantity

Complex quantity

None of these

Inverter is the name given to:

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NOT gate

OR gate

NOR gate

AND gate

XOR gate

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Physics is one of the branches of:

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Social sciences

Physical sciences

Biological sciences

Abstract art

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

As the droplet accelerates, the upward drag force on it

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Increases

Decreases

Suspended

None of these

In launch mass of the rocket fuel is

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70%

80%

more than 80%

90%

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

Maximum number of orders available with a grating is ______ grating element

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Independent of

Directly proportional to

Inversely proportional to

Equal to

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

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Number

K.E

P.E

Frequency

The low blood pressure is known as

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Diastolic

Systolic

Low blood pressure

None of these

The fractional effect between layers of following fluid is

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Viscosity of fluid

Velocity of fluid

Acceleration of fluid

Pressure of fluid

The SI units of flow rate are

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m²s^-1

m³s^-2

m³s^-1

m²s^-2

The magnitude of X and Y component of P are 7 and 6.The magnitude of X and Y components of P + Q are 11 and 9 respectively. What is the magnitude of Q

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9

8

6

5

A charge -4 μ C is at origin and +16 μ C is at a distance 3 m on positive x-axis the zero field is located at

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3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

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