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Q:

The cover of a solar coker is made of glass because 

A) it absorbs sun's rays B) it reflects sun's rays
C) it retains the heat inside by the green house effect D) it rediates heat better than metals

Answer:   C) it retains the heat inside by the green house effect



Explanation:

As the inside of the cooker is painted black, heat absorption is more producing heat waves of longer wavelength which cannot escape through glass and hence are trapped inside. Thus the food is cooked.

Subject: Physics
Q:

Buoyancy depends on

A) the mass of the liquid displaced B) the mass of the body
C) the depth to which the body is immersed D) the shaped of the body
 
Answer & Explanation Answer: A) the mass of the liquid displaced

Explanation:

Buoyancy or Upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.

In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.

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1 64
Q:

Which of the following is a Non Renewable Resource of Energy?

A) Wind Power B) Hydrogen Fuel
C) Natural Gas D) Solar Energy
 
Answer & Explanation Answer: C) Natural Gas

Explanation:

Natural Gas is a Non Renewable Resource of Energy because that does not renew itself once used, unlike the other choices. 

It is a resource that will not be naturally replenished.

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2 17
Q:

Is Air a Mixture?

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True, Air is a Mixture.


Air is considered as mixture for the following reasons ;


1. Air can be separated into its components like N2, O2 , Argon and CO2 by the process of fractional distillation of liquid air.


2. Air shows the properties of all the gases present in the atmosphere.
For example : Oxygen is good Supporter of combustion. Hence air also is good supporter of combustion.


3. Air does not have a fixed formula.


4. Air has a variable composition because air at different places contains different amount of gases.


5. Heat or Light energy is neither absorbed nor released when air is prepared physical by mixing required amount of gases .


6. Mixture does have fixed boiling Point. It holds good in case of liquid air.

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3 37
Q:

Which of the following is a Heterogeneous Mixture?

A) Air B) Table salt
C) Soda D) Brass
 
Answer & Explanation Answer: C) Soda

Explanation:

Here Soda is a Heterogenous Mixture.

 

A Heterogeneous Mixture is a mixture having a non-uniform composition i.e, the mixture contains components in different phases. Using various means, the parts in the mixture can be separated from one another.

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Q:

A Step-Up Transformer Increases

A) Power B) Current
C) Frequency D) Voltage
 
Answer & Explanation Answer: D) Voltage

Explanation:

A transformer that increases voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a Step-Up Transformer.

Conversely, a transformer designed to do just the opposite is called a Step-Down Transformer. 

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4 34
Q:

Friction can be reduced by changing from

A) Static to Dynamic B) Rolling to Sliding
C) Dynamic to Static D) Sliding to Rolling
 
Answer & Explanation Answer: D) Sliding to Rolling

Explanation:

Any object rolls when there is no friction. So, Sliding to Rolling is correct.

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7 83
Q:

Fog is an example of a

A) liquid dispersed in gas B) solid dispersed in liquid
C) liquid dispersed in solid D) gas dispersed in liquid
 
Answer & Explanation Answer: A) liquid dispersed in gas

Explanation:

Fog is an example of a colloidal system liquid dispersed in gas.

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5 142
Q:

At what temperature (in Fahrenheit) pure water freezes?

A) 0 B) 17
C) 32 D) 39
 
Answer & Explanation Answer: C) 32

Explanation:

32oFWe know that T(°F) = T(°C) × 1.8 + 3232(°F) = 0(°C)

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