# 12th Class Physics Chapter Wise MCQs:

Karachi board, Sukkur board, Hyderabad board, Larkana board, Mirpur Khas board.

# Sindh->12th Class->Physics MCQs

Sindh Question:

A: 10 Volt
B: 100 Volt
C: 1000Volt
D: 5000Volt
Maham

Sindh Question:

## A device for actually observing the paths of alpha and beta particles is a

A: Cyclotron
B: G.M counter
C: M.spectrograph
D: Wilson cloud chamber
Maham

Sindh Question:

## Solid state detector work when they are

A: Forward biased
B: Reversed biased
C: Not biased
D: None of these
Maham

Sindh Question:

A: Cathode
B: Anode
C: Neutral
D: None
Maham

Sindh Question:

## Geiger muller counter uses

A: Alcohol only
B: Argon and alcohol
C: Argon
D: Bromine
Maham

Sindh Question:

A: Mass
B: Momentum
C: Charge
Maham

Sindh Question:

## In wilson cloud chamber radiations become visible reflection of light from

A: Ions
C: Glass window
D: Droplets of fog
Maham

Sindh Question:

## A thermistor is a resistor which is ________________

A: light sensitive
B: heat sensitive
C: sound sensitive
D: all of these

Sindh Question:

## The emf of a source is _______________________

A: a force measured in newton
B: work done per unit time
C: not a force and measured in joule
D: a force and measured in volts

Sindh Question:

## Thermistors are prepared under_________________

A: high pressure and low temperature
B: high pressure and high temperature
C: low pressure and low temperature
D: low pressure and high temperature

Sindh Question:

## The emf E of a source is the ________________________

A: energy supplied to all the charges by the cell
B: energy supplied to by the cell to unit charge
C: force applied on different charges
D: workdone on all the charges

Sindh Question:

A: copper
B: aluminium
C: silver
D: tungsten

Sindh Question:

## Conductance is ________

A: another name of resistance
B: reciprocal o f resistance
C: measured in ohm
D: both B and C

Sindh Question:

A: ohm
B: ohm per meter
C: ohm-meter
D: meter per ohm

Sindh Question:

## Resistance of the wire is proportional __________

A: directly to its length
B: directly to its area
C: inversly to its area
D: both A and C

Sindh Question:

## As the current flows through the wires _________

A: heat is generated
B: sound is produced
C: resistance of the wire decreases
D: voltage increases

Sindh Question:

## The current that flows through the coil of a motor causes

A: its shafts to rotate
B: its brushes to rotate
C: motor to move
D: its shafts to revolve

Sindh Question:

A: electrons
B: positrons
C: positive ions
D: Both A and C

Sindh Question:

A: zero
B: much larger
C: larger
D: smaller

Sindh Question:

A: thermister
B: thermometer
C: thermostat
D: thermocouple

Sindh Question:

## The conventional current is the name given to the flow of _____________

A: positrons
B: positive charges
C: negative charges
D: none of these

Sindh Question:

## All natural process proceed in the direction of

A: increased entropy
B: decreased entropy
C: no entropy
D: none of these

Sindh Question:

## entropy means the

A: order of a system
B: disorder of the system
C: energy available
D: none of these

Sindh Question:

## If the temperature of the sink is decreased, efficiency of the carnots engine

A: remains unchanged
B: increased
C: decreases
D: becomes 4 times

Sindh Question:

A: reversible
B: irreversible
C: ideal
D: both A and C

Sindh Question:

## Thermal radiations are type of

A: mechanical waves
B: transverse waves
C: electromagnetic waves
D: electrons

Sindh Question:

## In the formula PV=nRT, n represent

A: number of molecules per unit volume
B: number of moles
C: number of molecules
D: number of atoms

Sindh Question:

## Boltzman constant is actually

A: gas constant per mole
B: gas constant per kg
C: gas constant per molecule
D: product of pressure and area

Sindh Question:

## When a gas is compressed

A: its internal energy decreases
B: its temperature decreases
C: its temperature increases
D: nothing happens