6
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:   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.

Subject: Physics
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Q:

Heat transfer by conduction occurs when molecules

A) Collide B) Combine
C) Heated D) None of the above
 
Answer & Explanation Answer: A) Collide

Explanation:

Conduction is the movement of heat through a substance by the collision of molecules. It occurs when two object at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.

Heat_transfer_by_conduction_occurs_when_molecules1560488148.jpg image

 

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0 17
Q:

In order to make an electromagnet you need a

A) Dry cell batteries B) Thin coated copper wire
C) Iron nail D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

To create a simple electromagnet, you'll need a source of electricity, a conductor, and metal. Wrap insulated copper wire tightly around an iron screw or nail before connecting the wire to a battery, and watch as your new electromagnet picks up small metal objects.

 

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0 63
Q:

Gasoline is useful in cars because it has

A) chemical potential energy B) electrical potential energy
C) gravitational potential energy D) kinetic energy
 
Answer & Explanation Answer: A) chemical potential energy

Explanation:

Gasoline is a colorless petroleum-derived flammable liquid that is used primarily as a fuel in spark-ignited internal combustion engines. It consists mostly of organic compounds obtained by the fractional distillation of petroleum, enhanced with a variety of additives. It is also called as Petrol. It has chemical potential energy, in combustion it is turned into light, sound, heat and kinetic energy.

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0 39
Q:

The wavelike properties of electrons are useful in

A) Magnifying objects B) Lasers
C) Weather reports D) All of the above
 
Answer & Explanation Answer: A) Magnifying objects

Explanation:

The photoelectric effect pointed to the particle properties of light, which had been considered to be a wave phenomenon. Particles like electron and protons have both particle like and wave like behavior. Thus, according to de Broglie, all the material particles in motion possess wave characteristics. Although the dual nature of matter is applicable to all material objects but it is significant for microscopic bodies only.

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3 19
Q:

The solubility of a gas in a liquid is

A) increased with increasing pressure B) decreased with increasing temperature
C) Both A & B D) None of the above
 
Answer & Explanation Answer: C) Both A & B

Explanation:

The solubility of a gas in a liquid is directly and inversely proportional to pressure and temperature respectively.

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0 18
Q:

Through which light cannot pass?

A) Notebook paper B) Water
C) Book D) Sun glasses
 
Answer & Explanation Answer: C) Book

Explanation:

The objects through which light cannot pass are called as Opaque objects. Some objects allow some light to pass through them and are called as Translucent objects. The objects which allow all the light to pass through them are called as Transparent objects.

 

Here in the given options Book is an example of opaque object as it does not allow light to pass through it. Water is transparent object and notebook paper and sun glasses are examples of translucent objects.

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1 13
Q:

Which of these instruments is used to measure the wind speed?

A) Anemometer B) Inclinometer
C) Fathometer D) Calorimeter
 
Answer & Explanation Answer: A) Anemometer

Explanation:

Anemometer is the instrument that is used for measuring the speed of wind or any gas currents.

Which_of_these_instruments_is_used_to_measure_the_wind_speed1560165843.jpg image

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0 27
Q:

Stars are held together by

A) Gravitational forces B) Electrical forces
C) Ionic forces D) Magnetic forces
 
Answer & Explanation Answer: A) Gravitational forces

Explanation:

A star is a self luminous astronomical object and shines due to internal radiation from the enrgy sources. All stars are held together by their own gravity called Gravitational force.

Stars_are_held_together_by1560151249.jpg image

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