AIPMT 2015 Cancelled Paper | Electromagnetic Waves Question 17 | Physics

AIPMT 2015 Cancelled Paper

MCQ (Single Correct Answer)

-1

A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light)

$${{2E} \over {{C^2}}}$$

$${E \over {{C^2}}}$$

$${E \over C}$$

$${{2E} \over C}$$

AIPMT 2014

MCQ (Single Correct Answer)

-1

Light with an energy flux of 25 $$ \times $$ 10⁴ W m^$$-$$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm², the average force exerted on the surface is

1.25 $$ \times $$ 10^$$-$$6 N

2.50 $$ \times $$ 10^$$-$$6 N

1.20 $$ \times $$ 10^$$-$$6 N

3.0 $$ \times $$ 10^$$-$$6 N

NEET 2013 (Karnataka)

MCQ (Single Correct Answer)

-1

An electromagnetic wave of frequency $$\upsilon = 3.0$$ MHz passes from vaccum into a dielectric medium with relative permittivity $${{\varepsilon _r}}$$ = 4.0. Then

Wavelength is doubled and frequency becomes half.

Wavelength is halved and frequency remains unchanged.

Wavelength and frequency both remain unchanged.

Wavelength is doubled and frequency unchanged.

NEET 2013

MCQ (Single Correct Answer)

-1

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

Microwaves are heat waves, so always produce heating.

Infra-red waves produce heating in a microwave oven.

The frequency of the microwaves must match the resonant frequency of the water molecules.

The frequency of the microwaves has no relation with natural frequency of water molecules.

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Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution