14
Q:

# The base of an electric iron is brightly polished mainly

 A) to make it smooth and frictionless B) to make it rust-proof C) to reduce heat loss by radiation D) to make it more durable

Answer:   C) to reduce heat loss by radiation

Explanation:

Polished surfaces are poor radiators of heat. So loss of heat on that account is reduced and the electric iron remains hotter than otherwise.

Subject: Physics
Q:

Unresolved dissonance is a characteristic of

When the tension is unresolved, we have unresolved dissonance. Unresolved dissonance is a characteristic of the baroque music.

The general characteristics of Baroque music is movement, energy, and tension.

32
Q:

What is the relationship between Resistivity and Conductivity?

Resistivity :

Resistivity is a measure of the resistance to the flow of electrons.

Conductivity :

Conductivity is just the inverse of resistivity, σ = 1/ρ, where σ is conductivity and ρ is resistivity.

Example:

Think of a pipe and water, the bigger the pipe, the easier water can flow and thus the lower the resistance.

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25
Q:

What frequency range is the high frequency band?

 A) 3 kHz B) 3 to 30 MHz C) 30 to 300 MHz D) 10 GHz

Answer & Explanation Answer: B) 3 to 30 MHz

Explanation:

The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz.

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0 39
Q:

Which of the following has the highest frequency?

 A) Cosmic rays B) X-rays C) Radio waves D) Microwaves

Answer & Explanation Answer: A) Cosmic rays

Explanation:

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0 29
Q:

Reading of a barometer going down is an indication of

 A) Storm B) Rainfall C) Snow D) Intense heat

Explanation:

Barometer is instrument which is used to measure to pressure. A slow downfall of reading suggests a low pressure area is passing in a nearby region, it may rains. If the reading is going down very fast then its an indication of storm (within 5-6 hours).

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0 42
Q:

Wind and solar energy are examples of

 A) Non renewable B) Renewable C) Unsustainable D) Limited

Explanation:

Many types of renewable energy resources such as wind and solar energy are constantly replenished and will never run out.

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0 55
Q:

Which of the following is not an aerosol?

 A) mud B) dust C) smoke D) fog

Explanation:

Among the given options, mud is not an aerosol.

An aerosol is a suspension of fine solid particles or liquid droplets, in the air or another gas. Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants, and smoke.

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0 56
Q:

What measures Air pressure?

 A) Barkometer B) Bolometer C) Spectrometer D) Barometer

Explanation:

Air Pressure can be defined as the pressure of air in the earth's atmosphere. It reaches a maximum of about 100,000 Pa near sea level and decreases as altitude increases.

The barometer is an instrument which is used for measuring Air pressure.

Physics instruments and their uses:

Barkometer  - - - Tanning liquors used in tanning leather

Bolometer  - - - Electromagnetic radiation

Spectrometer - - -  Properties of light.