Physics

Sound is measured in...

• Decibels

• Loudness

• Amplitude

• Sound

At room temperature, an intrinsic semiconductor has ……….

• Many holes only

• A few free electrons and holes

• Many free electrons only

• No holes or free electrons

find the correct applications of quantum mechanics.

• Quantum mechanics is used to explain the concept of

  photoelectric effect.

• The atomic structure and the origin of spectral lines are explained by Bohr based on quantum concepts.

• The phenomenon like Scattering of X-rays are

  explained by Compton based on quantum ideas.

• Based on quantum ideas, the problem

  of specific heat of solids at low temperature

  is explained successfully.

What does the p stand for?

• power

• momentum

• pressure

• principle axis

Light from the sun reaches us in nearly

• 2 minutes
• 4 minutes
• 8 minutes
• 16 minutes

The most commonly used semi-conductive material is -

• Germanium

• Silicon

• Carbon

• Sulphur

he liner velocity of an object and angular velocity are related by

• $v=r\omega$

• $v=\frac{\omega2}{r}$

• $v=\frac{\omega}{r^2}$

• $v^2=r.\omega^2$

The time required for one complete revolution is:

• torque

• frequency

• period

• rotational kinetic energy

The operator ∇² is called _______ operator

• Hamiltonian

• Laplacian

• Poisson

• Vector

The easiest way to open a heavy door  is by applying the force

• Near the hinges
• In the middle of the door
• At the edge of the door far from the hinges
• At the top of the door