## 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 doctor
- 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 the 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 the 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)
- Transmitter
- 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 the Nuclear Fission reactor?

- fuel
- accelerator
- moderator
- None of these

Q#11:- A Watt – a 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 lose 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 the neutron.

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

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

- chemical energy ( Right Answer)
- heat energy
- Electrical energy
- Elastic potential energy

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

- Circulatory system
- The nervous system ( Right Answer)
- Excretory system
- 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:

- 6/√3
- −6√3
- 6
- −6 ( Right Answer)
- 12

Q#26:- The hydraulic automobile jack illustrates:

- Archimedes’ principle
- Pascal’s principle ( Right Answer)
- Hooke’s law
- Newton’s third law
- 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 Subject specialist S S Past papers

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

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