Question # 1

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is.

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0°

60°

120°

180°

A force of 10N is acting along y-axis its component along x-axis is

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10N

20N

100N

Zero N

When a hydrogen atom is bombarded the atom is excited to the n = 4 state of hydrogen atom.The energy released when the atom falls from n = 4 state to the ground state is

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1.275 eV

12.75 eV

5 eV

8 eV

Band spectrum in produced by

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H

He

H₂

Na

A pendulum clock set to give correct time in Karachi is taken to Quetta it would give correct time if

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The mass of the pendulum is increased

The mass of the pendulum is decreased

The length of the pendulum os increased

The length of the pendulum is decreased

The peak voltage in a 200 volt A.C supply is nearly

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220

253

311

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

The frequency of the incident light falling on a photosensitive metal plate is doubled the kinetic energy of the emitted photoelectrons is

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Double the earlier value

Unchanged

More than doubled

Less than doubled

The henry is the unit for

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Resistance

Magnetic flux

Magnetic field

Inductance

The minimum wavelength of the X-rays produced by electrons accelerated through a potential difference of V volts is directly proportional to

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√V

V²

1/√V

1/V

Which of the following particle would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

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Proton

Electron

He⁺

Li⁺

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