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

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

When an electron is accelerated through a P.D. of an one volt, it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

The net force acting on a 100 kg man standing in an elevator accelerating downward with a = 0.8 m sec^-2comes out to:

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980 N

580 N

1380 N

Zero

The L-C parallel circuit the capacitor draws a

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leading current

lagging current

main current

none of these

The restoring force is ______ and opposite tot he applied force within ______

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Equal, Elastic limit

Different, The walls of the laboratory

Different, Elastic limit

None of these

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

The graphical representation of ohm's law is

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hyperbola

straight line

ellipse

parabola

Which of the following options correctly states the equation of continuity for an ideal fluid?

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A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

Dimensions of velocity are

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[L]

[T]

[LT^-1]

[LT^-2]

Two forces each of 10 N act on a body, if the force are inclined at 30° and 60° respectively with x-axis, then x-component of their resultant is:

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20 N

13.66 N

10 N

8.66 N

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

When two charged conductors are brought into contact the electric charge on them is shared

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Equally

Proportion to their capacitance

Inversely as their capacitance

None of these

Sunlight is also partially polarized because of Earth's atmosphere due to scattering by

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Water vapours

Air particles

Dust particles

All of these

The unit of intensity of electric field is

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newton/coluomb

Joule/culomb

Volt x metre

Newton/meter

Wavelength of the wave is the distance between the particles of the medium having adifference of:

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Zero

n

2n

𝜋2

In between two consecutive permissible energy band there is a range of energy states which cannot be occupied by electrons. These are called

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Energy band

Energy states

Forbidden energy gap

None of these

Substances which flow easily are

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Water

Kerosene oil

Petrol

All of these

The value of universal gas constant R is:

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8.314 J/K mole K

8314 J/ mole K

8.314 J/ mole K

None of these

The modulus of rigidity of a liquid is

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Zero

1

Infinite

None of these

The displacement time graph for the two particles A and B are straight lines inclined at 60° and 30° with the same axis.The ratio of the velocity of B is

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1:1

2:1

3:1

4:1

Viscosity of water at 30^oC in Nsm^-2

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0.521 × 10^-3

0.564 × 10^-3

0.594 × 10^-3

0.599 × 10^-3

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