Electromagnetic Waves Test

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Electromagnetic Waves Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Radio waves for FM radio have a frequency about

A
100 MHz

B
100 GHz

C
100 KHz

D
100 Hz

Solution

Frequency band of FM broadcast is 88 - 108 MHz.c
Question 2
1 / -0

Electromagnetic waves for TV and FM radio have a frequency about

A
750 GHz

B
750 MHz

C
750 Hz

D
750 KHz

Solution

Frequency range for TV and FM radio is 54 - 890 MHz.
Question 3
1 / -0

Microwaves have a frequency of about

A
10 MHz

B
10 KHz

C
10 Hz

D
10 GHz

Solution

Microwaves have frequency range 10⁹ Hz to 10¹²Hz.
Question 4
1 / -0

Food is heated in a microwave oven because

A
Resistance heating takes place supplying heat to the food

B
Water molecules absorb microwave radiation

C
Radiation from oven walls heats the food

D
Oven walls conductively heat the food

Solution

The frequency of rotation of water molecules is about 300 crore hertz, which is 3 gigahertz (GHz). If water receives microwaves of this frequency, its molecules absorb this radiation, which is equivalent to heating up water. These molecules share this energy with neighbouring food molecules, heating up the food.
Question 5
1 / -0

Infrared waves are produced by

A
permanent magnets

B
static charges

C
dipole oscillations

D
all hot bodies and molecules

Solution

When an object gets heated, it gains energy as a result of which the atoms or molecules move or vibrate and radiate infrared waves.
Question 6
1 / -0

Infrared waves are sometimes referred to as heat waves because

A
water molecules present in most materials readily transmit infrared waves

B
water molecules present in most materials readily reflect infrared waves

C
water molecules present in most materials readily absorb infrared waves

D
water molecules present in most materials readily reradiate infrared waves

Solution

water molecules and also (CO₂ and NH₃molecules) present in most materials readily absorb infrared waves, increases the thermal motions and heat up the materials and their surroundings.

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Re-Attempt Weekly Quiz Competition

Electromagnetic Waves Test - 5

Result

Electromagnetic Waves Test - 5

Score

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Rank

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SHARING IS CARING

Question 1

100 MHz

100 GHz

100 KHz

100 Hz

Solution

Question 2

750 GHz

750 MHz

750 Hz

750 KHz

Solution

Question 3

10 MHz

10 KHz

10 Hz

10 GHz

Solution

Question 4

Resistance heating takes place supplying heat to the food

Water molecules absorb microwave radiation

Radiation from oven walls heats the food

Oven walls conductively heat the food

Solution

Question 5

permanent magnets

static charges

dipole oscillations

all hot bodies and molecules

Solution

Question 6

water molecules present in most materials readily transmit infrared waves

water molecules present in most materials readily reflect infrared waves

water molecules present in most materials readily absorb infrared waves

water molecules present in most materials readily reradiate infrared waves

Solution

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