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	Strictly speaking, the earth is:	A. An accelerated frame of reference B. A non-inertial frame of reference C. An inertial frame of reference D. ^{A non-accelerated frame of reference}
2	G.P. Thomson observer experimentally that electrons and neutrons possess	A. particle-like properties B. wave-like properties C. neither particle nor wave like properties D. none of these
3	The nature of radiations emitted by a hot body depends upon its:	A. Metarial B. Temperature C. colour D. Volume
4	When a platinum wire is heated, it appears yellow at	A. 1600°C B. 900°C C. 1100°C D. 1300°C
5	According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the	A. number of photoelectrons B. size of the photoelectrons C. charge on photoelectrons D. K.E of photoelectrons
6	Compton studied the scattering of x-rays by loosely bound electrons from:	A. NaCl crystal B. Graphite crystal C. Zirconia D. Copper crystal
7	A photon is considered to have	A. Momentum B. Energy C. Wavelength D. All of the above
8	Wien's constant is measured in:	A. Metre per kelviin B. Metre kelvin C. Kelvin per meter D. Joules
9	Which of the following phenomenon proves the particle nature of light	A. interference B. diffraction C. photoelectric effect D. none of these
10	A high temperature, the proportion of shorter wavelengths radiation, emitted by the body	A. decreases B. first increases then decreases C. increases D. any one of them

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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 way through which electromagnetic radiations or photons interact with matter depends upon their:

When platinum wire is heated, then at the temperature of 500 oC, it becomes:

According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the

Photocell is a device which converts

There is no way to detect:

Which of the following is not an example of intertial frame

The mass 'm' of a body moving at 0.8 c (whose rest mass is mo) becomes

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

The concept of direction and position are purely

Converse of pair production is known as

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 non-inertial frame of reference is one, in which

At the temperature, a body emits radiation which is principally

A black body is

The energy of the 4th orbit in hydrogen atom is

If a material object moves with the speed of light 'C' its mass becomes

Compton shift refers to:

Compton studied the scattering of x-rays by loosely bound electrons from:

Due to relative motion of observer and the frame of reference of events, time always:

As the light shines on the metal surface, the electrons are ejected

Photoelectric effect takes place with a photon of:

With the help of 50 K v electron microscope, a resolution of

The mass of an object will be doubled at speed

The special theory of relatively treats the problems involving:

An inertial frame is that frame in which

The value of the plank's constant 'h' is given by

Photoelectrons are emitted when ultraviolet light falls on:

Electromagnetic -radiation means:

The idea of quantization of energy was proposed by:

The speed of a pendulum is measured to be 3.0 s in the inertial reference frame of the pendulum. What is its period measured by an observer moving at a speed of 0.95 c with respect to the pendulum

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ECAT Physics Chapter 19 Important MCQ's

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When platinum wire is heated, then at the temperature of 500 ^oC, it becomes: