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# PPSC Physics Subject specialist S S & SENIOR SUBJECT SPECIALIST S S S Past papers

## PPSC Physics Subject specialist S S & SENIOR SUBJECT SPECIALIST S S S Past papers

Q#1:- A portable device which is widely used for the detection of ionizing particle or radiations:

• Solid state dector
• Geiger counter ( Right Answer)
• Wilson cloud chamber
• All of these
• None of these

Q#02:- 1 Kwh=

• 6×10^2 Joule
• 6×10^5 Joule
• 6×10^6 Joule
• 36×10^5 Joule ( Right Answer)
• 36×10^4 Joule

Q#03:- The essential part/s of a moving coil galvanometer is/are:

(I) A U-Shaped permanent magnet with cylindrical concave pole-pieces (II) A flat coil of thin enamel insulated wire usually rectangular (II) An spiral metallic wire connected to external terminal

• I only
• I & II only ( Right Answer)
• I, II & III
• II & III
• III only

Q#04:- Calculate the centripetal acceleration and centripetal force on a man whose mass is 80 kg when resting on the ground at the equator if the radius of earth is 6.4×10^6 m.

• 69 N
• 35 N
• 69 N ( Right Answer)
• 65 N
• 78 N

Q#05:- The process of combining audio frequency (a-f) and radio frequency (r-f) waves to accomplish translational is called:

• Transmission
• Rectifier
• Modulation ( Right Answer)
• Crystal Diode
• Carrier Signal

Q#06:- 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?

• 10 cm ( Right Answer)
• 20 cm
• -20 cm
• 5 cm
• -30 cm

Q#07:- The electron acquires a speed of 10^6 ms^-1. Find its energy in electron volts:

• 66 ev
• 84 ev ( Right Answer)
• 23 ev
• 34 ev
• 68 ev

Q#08:- A basic electric instrument which is used for the detection (or measurement) of small current:

• Ammeter
• Voltmeter
• Galvanometer ( Right Answer)
• Transmeter
• All of these

Q#09:-ΔV/ΔS is the rate of change of potential with respect to the distance and it is called:

• Electric field
• Electric flux
• Potential Difference
• Potential Gradient ( Right Answer)
• Electric intensity

The resonant frequency of an LC-Circuit is:

• f = 2Π LC
• f = 1 / 2Π√ LC
• f = 1/ 2LC
• None of these

Q#10:- Which one of the following is NOT needed in Nuclear Fission reactor?

• fuel
• accelerator
• moderator
• None of these

Q#11:- A Watt – sec is a unit of:

• Force
• Energy
• Power
• None of these

Q#12:- The force on a charge moving with the velocity in a magnetic field B is given by:

• F = (q/v x B)
• F = ( qv x B )
• F = (qv + B)
• None of these

Q#13:- The half life of a radioactive isotope is 140 days. How many days would it take to loose 3/4 of its

Initial activities:

• 105 days
• 280 days
• 35 days
• None of these

Q#14:- A U-235 nucleus will split when it captures:

• an α-particle
• m. radiation
• neutron
• None of these

Q#15:- An LRC Circuit has R= 4Ω, Xc = 3 and XL=6, the impedance of the circuit is:

• 5 Ω
• 7 Ω
• 13 Ω
• None of these

Q#16:- A magnetic field cannot:

• Accelerate a charge
• Exert a force on a charge
• Change the kinetic energy of a charge
• None of these

Q#17:-For hydrogen atom the energy needed to ionize it is____________ electron volts and the corresponding ionization potential is____________.

• 6 volts, 6 volts
• 12 volts, 12.6 volts
• 6 volts, 13 volts
• 6 volts, 13.6 volts ( Right Answer)

Q#18:-The length of a measuring rod is 1 m when it is at rest. What will its length be if it is moving with a velocity one third of the speed of light.

• 943 m ( Right Answer)
• 346 m
• 64 m
• 563 m
• 321 m

Q#19:-A changing current “i” in any circuit induces an emf “e” in that circuit, which is equal to:

• e = di/dt
• E = i dΦ/dt
• e = – L di/dt
• None of these

Q#20:-The resonant frequency of an LC-Circuit is:

• f = 2Π LC
• f = 1 / 2Π√ LC
• f = 1/ 2LC
• None of these

Q#21:- The induced current always flows in such a direction as to oppose the change which is giving rise to it, This state of:

• Ampere’s law
• Ohm’s law
• Newton’s law
• Hook’s law
• Lenz’s law ( Right Answer)

Q#22:- A neutron travels a distance of 12 m in a time interval of 3.6×10^-4 s. Assuming its speed was constant, find its kinetic energy. Take 1.7×10^-27 kg as the mass of neutron.

• 87 ev
• 78 ev ( Right Answer)
• 56 ev
• -8.56 ev
• 25 ev

Q#23:- The energy stored in the fossil fuel is

1. chemical energy ( Right Answer)
2. heat energy
3. Electrical energy
4. Elastic potential energy

Q#24:- Electrochemical energy is required for the working of

1. Circulatory system
2. Nervous system ( Right Answer)
3. Excretory system
4. Digestive system

Q#25:- A vector has a magnitude of 12. When its tail is at the origin it lies between the positive x

axis and the negative y axis and makes an angle of 30◦ with the x axis. Its y component is:

1. 6/√3
2. −6√3
3. 6
4. −6 ( Right Answer)
5. 12

Q#26:- The hydraulic automobile jack illustrates:

1. Archimedes’ principle
2. Pascal’s principle ( Right Answer)
3. Hooke’s law
4. Newton’s third law
5. Newton’s second law

Q#27:- What is the magnifying power of a convex lens of focal length 5 cm?

• 3
• 5
• 6 ( Right Answer)
• 20

Q#28:- Which portion of light has a wavelength in a range from 400 to 780 nm, with a frequency range of 405 to 790 Hz?

• infrared light
• visible light ( Right Answer)
• ultra-violet light
• none of the above

Q#29:- Candela is a unit of

• acoustic intensity
• electric intensity
• luminous intensity ( Right Answer)
• magnetic intensity

Q#30:- Which are different types of emission spectrum?

• continuous spectrum
• line spectrum
• band spectrum
• all of the above ( Right Answer)

## PPSC Physics SENIOR SUBJECT SPECIALIST S S S Past papers

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