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PPSC-FPSC Physics Solved MCQS Preparation for Test 2020
1. Which one is not a branch of physical science?
A. chemistry
B. Astronomy
C. geology
D. biology
ANSWER: D
2. Which branch of science plays an important role in the development of technology and engineering?
A. chemistry
B. physics
C. geology
D. biology
ANSWER: B
3. The number of categories in which physical quantities are divided are:
A. one
B. two
C. three
D. four
ANSWER: B
4. How many types of units are in SI?
A. one
B. two
C. three
D. four
ANSWER: C
5. In scientific notation numbers are expressed in:
A. power of ten
B. powers of two
C. reciprocal
D. decimal
ANSWER: A
6. 1024 can be written in scientific notation as:
A. 1.024x103
B. Raised to power 10
C. 0.000976
D. 1/0.00097
ANSWER: A
6. The process of combining audio frequency () and radio frequency () waves to accomplish translational is called:
A. transmission
B. rectifier
C. modulation
D. crystal diode
ANSWER: C
7. A convex lens of focal length 20 cm, is used to form an erect image which is twice as long as the object. Find the position of the object?
A. 10 cm
B. 20 cm
C. -20 cm
D. 5cm
ANSWER: A
8. The electron acquires a speed of 10^6 ms^-1. Find its energy in electron volts:
A. 66 ev
B.84 ev
C. 23 ev
D.34 ev
ANSWER: B
9. A basic electric instrument which is used for the detection (or measurement) of small current:
A. ammeter
B. voltmeter
C. galvanometer
D. transmitter
ANSWER: C
10. ΔV/ΔS is the rate of change of potential with respect to the distance and it is called:
A. electric field
B. electric flux
C. potential difference
D. potential gradient
ANSWER: D
11. The spherical shape of a small drop of a rain is due to:
A. viscosity
B. surface tension
C. atmospheric pressure
D. gravity
ANSWER: B
12. The blue color of sky can be attributed to:
A. differential scattering of the sunlight by the atmosphere
B. total internal reflection of the sunlight by the atmosphere
C. absorption
D. refraction of sunlight by the atmosphere
ANSWER: A
13. Which one of the following sets of properties are relevant for an electrical fuse wire needed for normal application?
A. thick wire, high melting point alloy, thin wire
B. thick wire, low melting point alloy, thin wire
C. short length, low melting point alloy, thin wire
D. large length, low melting point alloy, thin wire
ANSWER: A
14. Ice floats on water because the density of Ice is less that of water, Out of the following what part of giant icebergs remains above water?
A.1/10
B. 1/4
C. 1/2
D. 3/4
ANSWER: B
15. Which one of the following coolers has the longest wavelength?
A. green
B. yellow
C. blue
D. red
ANSWER: D
16. Which one of the following can be used to focus sunlight?
A. plan mirror
B. concave lens
C. concave mirror
D. convex mirror
ANSWER: C
17. Which one of the following is a good conductor of electricity?
A. PVC
B. glass
C. rubber
D. graphite
ANSWER: D
18. The tendency of a liquid drop to contract and occupy minimum area is due to:
A. surface tension
B. viscosity
C. density
D. vapour pressure
ANSWER: A
19. Choke coil is coil of:
A. high resistance and high inductance
B. low resistance and high inductance
C. high resistance and low inductance
D. low resistance and low inductance
ANSWER: B
20. Conductors, insulators and semi-conductors differ from each other due to property of:
A. ability off the current of carry
B. formation of crystal lattice
C. binding energy of their electrons
D. mutual width of their energy gaps
ANSWER: D
21. When a constant force is applied to a body it move with uniform:
A. momentum
B. velocity
C. speed
D. acceleration
ANSWER: B
22. The silvered surface of thermos flask prevents transfer of heat by:
A. conduction
B. convection
C. reflection
D. radiation
ANSWER: D
23. When wind blows at high velocity roof tops are blown off because pressure:
A. outside is more than inside the roof
B. inside is more than outside the roof
C. increases due to wind velocity
D. is exerted by air from outside
ANSWER: B
24. In a refrigerator, cooling is produced by:
A. the Ice is deposits on the freezer
B. the evaporation of a volatile liquid
C. the sudden expansion of a compressed gas
D. increase stability
ANSWER: B
25.One earth a removed from an electric bulb to prevent:
A. oxidation of tungsten filament
B. bursting of bulb
C. loss of light due to absorption
D. none of the above
ANSWER: A
26. A person climbing a hill bends forward in order to:
A. avoid slipping
B. increases speed
C. reduce fatigue
D. increases stability
ANSWER: D
27. On earth a moving body ordinarily comes to rest by it self because of the:
A. law off inertia
B. forces of friction
C. conservation of momentum
D. gravity
ANSWER: B
28. When the door of an operating refrigerator is opened the temperature of the room will:
A. decreases
B. remain unchanged
C. fall down immediately
D. increases
ANSWER: D
29. An electric motor is used to convert:
A. electrical energy into mechanical energy
B. mechanical energy into kinetic energy
C. mechanical energy into electrical energy
D. higher voltage to lower voltage
ANSWER: C
30. A moving ball stops due to action of:
A. nuclear forces
B. frictional forces
C. electric forces
D. magnetic forces
ANSWER: B
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4 comments:
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