Physics Questions And Answers For Competitive Exams

1. Which one of the following remains constant while throwing a ball upward?  
A.  Displacement
B.  Kinectic energy
C.  Acceleration
D.  Velocity



2. Light year is unit of :
a. time 
b. speed of light 
c. distance  
d.mass



3. The clouds float in the atmosphere because of their low:
a. temperature 
b.velocity 
c.pressure 
d.density




4. In the human eye, the focussing is done by:
a. to and fro movement of the eye lens 
b. to and fro movements of the retine 
c.change in the convexity of the eye lens 
d.change in the refrective index of the eye fluids




5.The technique used to transmit audio signal in television broadcasts is
a.amplitude modulation 
b.frequency modulation 
c.pulse code modulation 
d.time division multiplexing




6. SI unit of luminous intensity is___________?
a.lumen
b.lux
c.candela
d.watt




7. Pure water freezes at what temperature?  
A.  47 F
B.  32 F
C.  0 F
D.  19 F




8. Which instrument is used to measure altitudes in aircraft's ?
a. Audiometer
b. Ammeter
c.Altimeter
d. Anemometer




9.Low temperatures (cryogenies) find application in:
a. space travel, surgery and magnetic levitation 
b. surgery, magnetic levitation and telemetry 
c. space travel, surgery and telemetry 
d. space travel, magnetic levitation and telemetry





10. When water is heated from 0 degree C to 10 degree C its volume :
a. increases 
b. decreases 
c. does not change 
d. first decreases and then increases




11. Parasec is the unit of:
a. distance 
b. time 
c. intensity of light 
d. magnetic line





12. Two plane mirrors A and B are placed at a distance  12 cm apart facing towards each other. An object is placed in between them at a distance 8 cm from the mirror A. What will be the distance between the first two images formed in the mirror B ?
a. 4 cm b. 8cm c. 16 cm d.20 cm




13. When the same note is played on a sitar and a flute the sound produced can be distinguished from each other because of the difference in;
a. Pitch loudness and quality 
b. pitch and loudness 
c. quality only 
d. loudness only



14. Which instrument is used to measure changes in volume of substances ?
a. Dyanamo
b. Dilatometer
c. Cyclotron
d. Electroscope

                       
                                  Answers:

1. Answer :  Acceleration

2. Answer: distance

3. Answer: temperature

4. Answer: change in the convexity of the eye le

5. Answer: frequency modulation

6. Ans. 
  Candela
  luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye. The SI unit of luminous intensity is the candela (cd)

7. Answer : B.  32 F

8. Answer: Option C
Explanation:
Ammeter - Measures strength of electric current.
Audiometer - Measures intensity of sound.
Anemometer - Measures force and velocity of wind and directions.

9. Answer: space travel, surgery and magnetic levitation

10. Answer: first decreases and then increases

11. Answer: distance

12. Answer: 16 cm

13. Answer: quality

14. Answer: Option B
Explanation:
Dyanamo - is used to convert mechanical energy into electrical energy,
Cyclotron - is a charged particle accelerator which can accelerate charged particles to high energies,
Electroscope - is used to detect the presence of an electric charge.