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Q:

# The velocity required to place a vehicle in orbit round the moon is _______ that required to place it in orbit round the earth

 A) less than B) Greater than C) equal to D) greater than or equal to

Explanation:

This orbital velocity at the moon is less because orbital velocity = $\inline \sqrt{rg}$

where 'r ' is the orbital radius. i.e the distance of the body from the centre of the earth and 'g' is the acceleration due to gravity on the body in question. In the case of the moon both r and g are less than in the case of earth.

Subject: Physics
Q:

Which is best used as a sound absorbing material in partition walls ?

 A) Stone chips B) Steel C) Glass - wool D) Glass pieces

Explanation:

Materials that do not transfer mechanical energy well. These tend to be soft,flexible, low density, and with high surface area to linear area ratios.

Filed Under: Physics
Exam Prep: AIEEE

4 221
Q:

On which day ' National Science Day ' is celebrated in India ?

 A) February 23 B) February 25 C) February 26 D) February 28

Explanation:

National Science Day is celebrated in India on 28 February each year to mark the discovery of the Raman effect by Indian physicist Sir Chandrashekhara Venkata Raman on 28 February 1928.

Filed Under: Physics
Exam Prep: Bank Exams , CAT
Job Role: Bank Clerk

6 121
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

Explanation:

Filed Under: Physics

4 434
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

Explanation:

Filed Under: Physics

5 275
Q:

The quality of sound produced by an instrument depends on the

 A) Frequency B) Intensity C) Number of overtones D) None of these