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Q:

# Which of the following is the fastest communication channel?

 A) Microwave B) Optical fiber C) Radio wave D) All are operating at nearly the same propagation speed

Answer:   A) Microwave

Explanation:

A microwave is the fastest communication channel whereas Optical fiber is a way of transferring data not a way of communication.

Subject: Physics
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Q:

The combined gas law relates which of the following?

 A) Volume & Temperature B) Temperature & Pressure C) Volume & Pressure D) Volume, Temperature & Pressure

Answer & Explanation Answer: D) Volume, Temperature & Pressure

Explanation:

The combined gas law states that the ratio between the pressure-volume product and the temperature of a system remains constant.

Hence it depends on all the three Volume, Temperature & Pressure.

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Q:

Land is considered a resource because it

 A) is used to produce things B) requires labor to be useful C) is always available to use D) costs little or nothing to use

Answer & Explanation Answer: A) is used to produce things

Explanation:

Land is considered as an important resource because it is useful in producing many things. For example, in agriculture, land is used for cultivating the crop, in industrial use, it is used for constructing factories and to make products that we use.

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Q:

As water is cooled from 4 deg C to 0 deg C, its density

 A) increases B) decreases C) remains same D) None of the above

Answer & Explanation Answer: B) decreases

Explanation:

As water is cooled from 4 deg C to 0 deg C, the water reaches its freezing point and starts forming ice crystals. Then the volume of that ice cubes increases and its density decreases. Hence, it is the reason that ice will float on water as ice has less density than the water.

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Q:

The GPS device in an automobile uses which communication channel?

 A) Satellite B) Microwave C) Radio frequency D) Infrared

Answer & Explanation Answer: A) Satellite

Explanation:

All automobiles uses satellite communication channel for their GPS devices.

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Q:

What type of simple machine is an axe?

 A) Lever B) Wedge C) Both A & B D) The screw

Answer & Explanation Answer: C) Both A & B

Explanation:

The simple machine Axe is made up of both the lever arm and a wedge.

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Q:

The humidity of the air depends upon

 A) Weather B) Temperature C) Location D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

Humidity means the amount of watervapour present in the atmosphere. It depends on weather, location and temperature of the place.

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Q:

Which of these is true of all simple machines?

 A) these make work easier B) work input > work output C) Both A & B D) None of the above

Answer & Explanation Answer: C) Both A & B

Explanation:
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1 67
Q:

Which of the following is a renewable resource of energy?

 A) Hydrogen fuel B) Wind energy C) Solar energy D) All of the above

Answer & Explanation Answer: D) All of the above

Explanation:

Renewable energy is energy that is collected from renewable resources, which are naturally replenished on a human timescale, such as sunlight, wind, rain, tides, waves, and geothermal heat.

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