ECAT Pre General Science Chapter 19 online mcq test with answers for Physics chapter 19 (Dawn of Modern Physics)

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ECAT Physics Chapter 19 Important MCQ's

Sr.#	Question	Answer
1	The threshold frequency of sodium is 6 x 10⁶MHz. The cut-off wavelength for this metal will be	A. 500 m B. 500 nm C. 500 km D. 500 cm
2	the symbol to be used in relativity problems denotes:	A. Dilated time B. Proper time C. Life time D. Half time
3	The stopping voltage for a certain metal is 100 volts, then the work function for the cathode plate is	A. 100 J B. 1.6 x 10^-17J C. 100 eV D. 1.6 x 10^-17eV
4	A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is	A. 1.66 m B. 1.0 m C. 0.66 m D. 2.66 m
5	A non-inertial frame of reference is one, in which	A. law of inertial is valid B. all laws of physics are the same in all frames C. a>0 or a<0 D. a=0
6	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
7	The length contraction happens only	A. Opposite to the direction of motion B. along the direction of motion C. perpendicular to the direction of motion D. In any direction
8	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
9	The idea of quantization of energy was proposed by:	A. Einstein B. Max.Planck C. Maxwell D. Bohr
10	Wave nature of particle was proposed by	A. Einstein B. Plank C. De-Brogile D. Max well

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ECAT Pre General Science Physics Chapter 19 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

ECAT Pre General Science Physics Chapter 19 Dawn of Modern Physics

The Stephen-Boltzmann law for the black body radiation is given by

Intensity of light determines the:

Pair production is the phenomenon in which

At the temperature, a body emits radiation which is principally

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

The photon of radio-waves has energy of about

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

An intertial frame of reference is a frame of reference which is

The general theory of relativity treats problems involving

The Nobel Prize on the explanation of photoelectric effect was awarded to:

When a platinum wire is heated, it appears orange red at

The nature of radiations emitted by a hot body depends upon its:

The concept of direction is purely:

Which of the following is not an example of intertial frame

The special theory of relativity is based on the

The energy of a photon is represented by

The ratio of energy E to the corresponding frequency (f) of the radiation (emitted or absorbed) is called:

According to the special theory of relativity

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

Electromagnetic -radiation means:

the dilation of time applies to the timing processes which are:

Compton was awarded Nobel prize in physics in

A bar 1.0 m in length and located along x-axix moves with a speed of 0.75 c with respect to a stationary observer. The length of the bar as measured by the stationary observer is

The special theory of relativity is based on:

The special theory of relativity treats problems invoving

In order to produce pair production, a photon must have a energy

Max Planck received the Nobel Prize for his discovery of energy quants in:

The year when A.H. compton was awarded Nobel Prize is:

The energy of photon 'E' is proported to

When a position comes close to an electron they annihilate into photons such that

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ECAT Physics Chapter 19 Important MCQ's

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