Practice Practice quiz - general science mcq Online Quiz (set-1) For All Competitive Exams

Q-1)   What gases are filled in fluorescent tube?

(a)

(b)

(c)

(d)


Q-2)   Consider the following statements regarding a motor car battery:
  1. The voltage is usually 12 V.
  2. Electrolyte used is hydrochloric acid.
  3. Electrodes are lead and copper.
  4. Capacity is expressed in ampere-hour.
Which of the above statements are correct?

(a)

(b)

(c)

(d)

Explanation:


Q-3)   On charging by conduction, mass of a body may

(a)

(b)

(c)

(d)

Explanation:

On charging by conduction, body may gain mass, if it acquires negative charge. It may lose mass, if it acquires positive charge.


Q-4)   If the conductivity of a semiconductor is only due to break up of the covalent bonds due to thermal excitation, then the semiconductor is called

(a)

(b)

(c)

(d)


Q-5)   The current in the armature of a motor is reversed at every half cycle due to the action of a(n)

(a)

(b)

(c)

(d)


Q-6)   Nickel-Cadmium (Ni-Cd) battery is used in

(a)

(b)

(c)

(d)


Q-7)   Which one among the following is used to make periscope?

(a)

(b)

(c)

(d)


Q-8)   A wire with black insulation during electric supply is

(a)

(b)

(c)

(d)


Q-9)   Which of the following is an artificial magnet?

(a)

(b)

(c)

(d)


Q-10)   Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging

(a)

(b)

(c)

(d)

Explanation:

A loses electrons and B gains electrons. Therefore, mass of A < mass of B.