Science Physics MCQ-177

General Science-Physics Practice Questions for SSC, CDS, CivilsPrelims, DelhiPolice, UPPSC, UPSC, RBI, NDA Exams



Consider the following statements :

At the present level of technology available in India, solar energy can be conveniently used to
(1) Supply hot water to residential buildings
(2) Supply water for minor irrigation projects
(3) Provide street lighting
(4) Electrify a cluster of villages and small towns.

 
 
 
 

A fuse is used in mains electric supply as a safety devices. Which one of the following statements about the fuse is correct ?

 
 
 
 

.Consider the following statements :

An ordinary light bulb has a rather short life because the
1 . filament wire is not uniform
2 . bulb cannot be evacuated completely
3 . wires supporting the filament melt at high temperatures.

Which of the above statements are correct ?

 
 
 
 

Fluorescent tubes are fitted with a choke. The choke coil:

 
 
 
 

Consider the following statements regarding a motor car battery :

(1) The voltage is usually 12 V
(2) Electrolyte used in hydrochloric acid
(3) Electrodes are lead and copper
(4) Capacity is expressed in ampere-hour.

Which of the above statements are correct ?

 
 
 
 

Two wires have their lengths, diameters and resistivities all in the ratio of 1 : If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is :-

 
 
 
 

What is the order of magnitude of electric resistance of the human body (dry) ?

 
 
 
 

Assertion (A) : In our houses, the current in AC electricity line changes direction 60 times per second.

Reason (R) : The frequency of alternating voltage supplied is 50 Hz.

 
 
 
 

Which one of the following is printed on a commonly used fluorescent tube light ?

 
 
 
 

Which one of the following non-metals is not a poor conductor of electricity ?

 
 
 
 

Four wires of same material and of dimensions as mentioned below are stretched by a load of same magnitude separately. Which one of them will be elongated maximum ?

 
 
 
 

In a dry cell (battery), which of the following are used as electrolytes ?

 
 
 
 

Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is mercury used in the manufacture of these lamps ?

 
 
 
 

What is she difference between a CFL and an LED LAMP?

(1) To produce light, a CFL uses mercury vapour and phosphor while an LED lamp uses semi-conductor material.
(2) The average life span of a CFL is much longer than of and LED lamp.
(3) A CFL is LESS energy-efficient as compared to an LED lamp.

Which of the statements given above is/are correct ?

 
 
 
 

In electric supply lines in India, which parameter is kept constant ?

 
 
 
 

What is the maximum number of different electrical combination possible with three equal resistances ?

 
 
 
 

A substance -which radiates light when heated to a light temperature is said to be

 
 
 
 

Ohm’s law does not apply to which of the following ?

 
 
 
 

Which one of the following is used in storage batteries ?

 
 
 
 

A DC voltmeter is capable of measuring a maximum of 300 volts. If it is used to measure the voltage across a device operating at 220 voltage AC supply, the reading of the voltmeter will be

 
 
 
 

The circuit element where the impressed voltage is always in phase with the resulting current is

 
 
 
 

A permanent magnet repels

 
 
 
 

A straight horizontal conductor carries a steady electric current from south to north.
Which one of the following events would happen if a small magnetic compass is placed just above the wire ?

 
 
 
 

A proton, when accelerated through a potential difference of V volts, has an associated wavelength of ?. In order to have the same associated wavelength, an a-particle must be accelerated through a potential difference of

 
 
 
 

‘mho’ is the unit of