1
Q:

# What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

 A) 18 km/sec B) 11.2 km/sec C) 21 km/sec D) 35 km/sec

Explanation:

This 11.2 km/s is also known as the escape velocity. It works out to roughly 25000miles per hour

Subject: Physics
Q:

A Step-Up Transformer Increases

 A) Power B) Current C) Frequency 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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1 10
Q:

Friction can be reduced by changing from

 A) Static to Dynamic B) Rolling to Sliding C) Dynamic to Static D) Sliding to Rolling

Explanation:

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

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4 77
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

Explanation:

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

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5 114
Q:

At what temperature (in Fahrenheit) pure water freezes?

 A) 0 B) 17 C) 32 D) 39

Explanation:

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7 107
Q:

1 Joule is Equal to

 A) 10^3 ergs B) 10^6 ergs C) 10^7 ergs D) 10^5 ergs

Explanation:

1 Joule = 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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4 205
Q:

What is the difference between Thermal Energy and Heat Energy?

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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211
Q:

Rolling friction is caused by ____ from the following?

 A) Non-elastic effects B) Gravity C) Power dissipation D) Buoyancy

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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10 180
Q:

Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?

 A) K1k2/k1+k2 B) 2k1k2/k1+k2 C) K1+k2/k1k2 D) None

Explanation:

We know that,

The equivalent K =

where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.

But here L1 = L2 = L (say)

Then K = L+L/(L/K1 + L/K2)  =  $\frac{\mathbf{2}\mathbf{K}\mathbf{1}\mathbf{K}\mathbf{2}}{\mathbf{K}\mathbf{1}\mathbf{+}\mathbf{K}\mathbf{2}}$