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

Answer:   B) 11.2 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:

The capacity of a pure capacitor is 1 farad. In D.C circuit, its effective resistance will be

A) Zero B) Infinite
C) 1 Ohm D) 1/2 Ohm
 
Answer & Explanation Answer: B) Infinite

Explanation:
Report Error

View Answer Workspace Report Error Discuss

Filed Under: Physics

0 35
Q:

A convex mirror is used to form an image of a real object. The image

A) is diminished in size B) is erect
C) always lies between the pole and the focus D) all of the above
 
Answer & Explanation Answer: D) all of the above

Explanation:
Report Error

View Answer Workspace Report Error Discuss

Filed Under: Physics

0 31
Q:

The quality of sound produced by an instrument depends on the

A) Frequency B) Intensity
C) Number of overtones D) None of these
 
Answer & Explanation Answer: C) Number of overtones

Explanation:
Report Error

View Answer Workspace Report Error Discuss

Filed Under: Physics

0 35
Q:

In the electrical circuit of a house, the fuse acts as

A) a load B) a thermopile
C) a safety device D) a step down device
 
Answer & Explanation Answer: C) a safety device

Explanation:
Report Error

View Answer Workspace Report Error Discuss

Filed Under: Physics

0 23
Q:

The direction of heat flow between two objects depends on

A) Their masses B) Their heat contents
C) Their temperatures D) Whether they are in solid, liquid or gaseous state
 
Answer & Explanation Answer: C) Their temperatures

Explanation:

Heat always flows from a body at higher temperature to a body at a lower temperature.

Report Error

View Answer Workspace Report Error Discuss

Filed Under: Physics

1 28