12
Q:

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A) will increase B) will decrease
C) does not change D) varies with the increase of depth of the immersion of the iron piece

Answer:   A) will increase



Explanation:

When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at the botto also increases. Therefore the spring balance reading increases.

Subject: Physics
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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2 32
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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2 22
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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6 78
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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5 121
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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7 108
Q:

1 Joule is Equal to

A) 10^3 ergs B) 10^6 ergs
C) 10^7 ergs D) 10^5 ergs
 
Answer & Explanation Answer: C) 10^7 ergs

Explanation:

1 Joule107 ergs = 0.000239 Kilo Calories.

      • Joule is the Unit of Energy.

Joule is equal to Energy transferred to an object when a force of One Newton acts on that object in the direction of its motion through a distance of one metre.(1 N-m)

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4 206
Q:

What is the difference between Thermal Energy and Heat Energy?

Answer

Energy tranfer takes place either by means of Heat or Work only in Thermodynamics.


Heat :: Heat Energy is defined as Energy that can be transferred due to temperature change.


Whereas


Thermal Energy :: Thermal Energy is the Internal Energy stored in the system maintained at a certain Temperature.

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6 213
Q:

Rolling friction is caused by ____ from the following?

A) Non-elastic effects B) Gravity
C) Power dissipation D) Buoyancy
 
Answer & Explanation Answer: A) Non-elastic effects

Explanation:

Rolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed.

Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.

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10 186