Practice Questions set 5 - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?
(a)
(b)
(c)
(d)
Q-2) At magnetic poles, the angle of dip is
(a)
(b)
(c)
(d)
At poles, δ = 90°.
Q-3) The part of a transistor which is most heavily doped to produce large number of majority carriers is
(a)
(b)
(c)
(d)
Q-4) Consider the following statements regarding electric fuse wire: - It has low melting point.
- It has very high specific resistance.
- It is connected in parallel with the electric circuit.
Which of the statements given above is/are correct ?
(a)
(b)
(c)
(d)
An electric fuse wire should have low melting point and very high specific heat. Also it is connected in series with the electric circuit.
Q-5) Consider the following statements regarding a motor car battery:- The voltage is usually 12 V.
- Electrolyte used is hydrochloric acid.
- Electrodes are lead and copper.
- Capacity is expressed in ampere-hour.
Which of the above statements are correct?
(a)
(b)
(c)
(d)
Q-6) Consider the following statements. An ordinary light bulb has a rather short life because the - Filament wire is not uniform.
- Bulb cannot be evacuated completely.
- Wires supporting the filament melt at high temperatures.
Which of the above statements are correct?
(a)
(b)
(c)
(d)
Q-7) Consider the following statements : - An ammeter should have low resistance
- An ammeter should have high resistance
- A voltmeter should have low resistance
- A voltmeter should have high resistance
Which of the statements are correct ?
(a)
(b)
(c)
(d)
Ammeter is connected in series within the circuit. Therefore, the net resistance of the circuit increases and current to be measured decreases, so ammeter should have low resistance.
On the other hand voltmeter is connected in parallel within the circuit. This changes the overall current in the circuit and hence, the potential difference to be measured is also changed to minimise the error, so the equivalent resistance of the voltmeter should be large.
Q-8) If a bulb of 100 watt burns for 10 hours, the expenditure of electricity will be
(a)
(b)
(c)
(d)
Q-9) To obtain a p-type germanium semiconductor, it must be doped with
(a)
(b)
(c)
(d)
For p-type semiconductor the doping impurity should be trivalent.
Q-10) Consider the following statements :
- An ammeter is always connected in series in the circuit.
- A voltmeter can only be connected in series in the circuit.
- A voltmeter has low resistance.
Which of these statements) is/are correct?
(a)
(b)
(c)
(d)
If you connected a voltmeter in series all you are doing is measuring the difference in potential across a strand of wire which will be zero (or very near).
To measure voltage you connect the voltmeter in parallel so that you measure the voltage from the – to the + or the voltage drop across a load.
For a voltmeter the higher the resistance the more accurate it is.