Question # 1

The information from far side of the universe are gathered by

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Radio telescope

Microscope

Telescope

Spectro scpe

Tick the correct statement:

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Both the potential and potential difference is scalars

Potential is a scalar but potential difference is a vector

Both are vectors

Potential is vector but potential difference is scalar

None of these

The ratio of the gravitational force F_gto the electrostatic force F_ebetween two electrons at the same distance apart is approximately

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9.8

24 x 10¹⁹

24 x 10⁴²

24 x 10^-44

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is:

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K/2

2 K

4 K

None of these

The heat required to raise the temperature of one mole of the substance through 1 K is called

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heat capacity

specific heat capacity

molar specific heat

all of them

The power dissipation in a pure inductive or capacitance circuit is

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maximum

positive

zero

none

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

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21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

A point on the rim of a wheel moves 0.2 m where the wheel turns through an angle is 14.3 degrees. The radius of the wheel is:

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0.05 m

0.08 m

0.8 m

0.008 m

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

If water in a closed bottle is taken up to the moon and opened, the water gets

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Freeze

Boiled

Dissociated into O₂and H₂

Evaporated

The critical temperature for mercury is

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1.18 K

4.2 K

3.72 K

7.2 K

Newtons third law also says that action and reaction forces always act on the

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Different bodies

Same bodies

Only one body

None of these

The index of refraction of diamond is 2.0 velocity of light in diamond in m/s is

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6 x 10⁸

3 x 10⁸

2 x 10⁸

1.5 x 10⁸

Inspite vibrations the force which hold the atoms in their ordered form is

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Vander vall force

Cohesive force

Adhesive force

None of these

If the acceleration due to gravity at the earth's surface is 9.8 m/s² and the mass of the earth is 80 times that of moon and radius of earth 4 times that of moon,the value of G at the moos's surface will be:

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9.8 m/s²

1.96 m/s²

4.9 m/s²

None of above

The electrical conductivities of insulators are ranging from

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10^-5to 10^-10(Ω m)^-1

10^-10to 10^-15(Ω m)^-1

10^-5to 10^-15(Ω m)^-1

10^-10to 10^-20(Ω m)^-1

Action and reaction forces always act on the

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same bodies

different bodies

either of them

neither of them

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

The maintaining the elastic limits of any body, the relation stress to strains is called

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Hooke's law

Pascal's law

Young's law

None of them

The original source of Wind energy is

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Tides

Waves

Sun

Moon

Two charges are placed a certain distance apart in air when a dielectric sheet is placed between them, the electro static force between them will

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Decrease

Increase

Remain unchanged

Become zero

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