Question # 1

What remains constant in the field of central force?

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Potential energy

Kinetic energy

Angular momentum

Linear momentum

A 220 V, 50 Hz, AC source is connected to an inductance of 0.2.H and a resistance of 20 ohm in series What is the current in the circuit?

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10 A

5 A

33.3 A

3.33 A

The de broglie wave corresponding to a particle of mass m and velocity v has a wavelength associated with it

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h/mv

hm v

mh/v

m/hv

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

Two forces of 10N and 15N are acting simultaneously on an object in the same direction. Their resultant is

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Zero

5N

25N

150N

If two non-zero vector ̅A̅ and ̅B are parallel to each other, then ̅A̅, ̅B is equal to

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Zero

AB

A + B

A - B

Two electric bulbs of 200 W and 100 W have same voltage.If R1 and R2 be their resistance respectively then

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R₁ = 2R₂

R₂ = 2R₁

R₂ = 4R₁

R₁ = 4R₂

Copper and germanium are cooled to 70 K from room temperature then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

As the electron in Bohr orbit of hydrogen atom passes from stat n = 2 to n = 1 the kinetic energy K and potential energy U change as

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K two-fold,U also two-fold

K four-fold,U also four-fold

K four-fold,U two-fold

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