Amount of substance is

(a)

directly proportional to the number of atoms

(b)

inversely proportional to the number of atoms

(c)

directly proportional to the square of number of atoms

(d)

inversely proportional to the square of number of atoms

If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?

(a)

10 cm

(b)

5 cm

(c)

20 cm

(d)

15 cm

The non-metal which conduct current is

(a)

carbon

(b)

oxygen

(c)

aluminium

(d)

sulphur

In Haber’s process of producing ammonia ______ is used as a catalyst.

(a)

Nitrogen

(b)

hydrogen

(c)

iron

(d)

nickel

The edible mushroom is _________

(a)

Polyporus

(b)

Agaricus

(c)

Pennicillium

(d)

Aspergillus

Who is the father of computer?

(a)

Martin Luther King

(b)

Graham Bell

(c)

Charlie Chaplin

(d)

Charles Babbage

An electroscope has been charged by induction with the help of charged glassrod. The charge on the electroscope is

(a)

negative

(b)

positive

(c)

both positive and negative

(d)

None of the above

In all atoms of an element

(a)

the atomic and the mass number are same.

(b)

the mass number is same and the atomic number is different

(c)

the atomic number is same and the mass number is different

(d)

both atomic and mass numbers may vary.

During puberty, the region below the waist become wider in _____________

(a)

boys

(b)

girls

(c)

Both a and b

(d)

None of these

In Tux Math, space cadet option is used for_________.

(a)

simple addition

(b)

division

(c)

drawing

(d)

multiplication