Question # 1

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

In rotational motion, analogue of force F us called:

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Couple

Torque

Mass

Moment of intertia

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

Electron is a particle whose mass is:

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Greater than that of a proton

Smaller than of a proton and greater than mass of neutron

Smaller than that of proton or neutron

Greater than that of an atom

The magnifier forms a virtual image of the object at:

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Least distance of distinct vision

Much farther than the least distance

Both A and B are correct

None of these

Op-amp has been discussed as comparator of:

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Distances

Voltages

Velocities

Magnetic fields

Both (A) and (C)

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Absolute motion cannot be detected

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in its own frame of references

in a different frame of references

both in its frame and different frame of references

none of these

A one microfarad capacitor of a TV is subjected to 4000 V potential difference The energy stored in capacitor is

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8 J

16 J

4 x 10^-3 J

2 x 10^-3 J

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Bulk modulus for mercury is

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27

29

29.4

30

The SI units of flow rate are

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m²s^-1

m³s^-2

m³s^-1

m²s^-2

Glass and high carbon steel are

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Brittle substances

Insulator

Ductile substances

None of these

Those solid which breaks soon after crossing the elastic limit are called

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Amorphous

Glassy solid

Crystalline solid

Brittle

For assessment of total uncertainty when percentage uncertainties are

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Added

Subtracted

Divided

Multiplied

A valance band in solids is

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Always completely filled

Empty

Either completely or partially filled

None

The example of nuclear fusion is:

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Formation of barium and krypton from uranium

Formation of plutonium -235 from uranium -235

Formation of helium from hydrogen

Formation of water from hydrogen and oxygen

The motion of planets in the solar system is an example of the conservation of:

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Mass

Linear momentum

Angular momentum

Energy

A force applied on a body produces acceleration in

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Its opposite direction

Its own direction

Right angle to the force

None of these

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