Physics MCQs Chapter 17+18

1.     The area method to find energy stored in deformed material is valid for

a)     Elastic region

b)    Non-elastic region

c)     Both a and b

d)    Elastic for small force

2.     Which of the following group represents donor atoms

a)     Indium, aluminum, phosphorous

b)    Aluminum, indium, gallium

c)     Phosphorous, antimony, arsenic

d)    None

3.     The Curie temperature is that temperature at which

a)     Semi-conductor becomes conductor

b)    Ferromagnetic becomes paramagnetic

c)     Paramagnetic becomes diamagnetic

d)    Metals becomes super conductor

1.c

2.c

3.b

Physics test chapter 15+16 (2) (Answer key)

1.c

2.a

3.b

4.c

5.a

6.c

7.b

8.a

9.B( dono se same current pas ho ga. 25 W waly bulb ko thora current chahye aur 100 W waly bulb ko zyada current chahye. For this reason 25 W bulb will grow bighter)

10.b

Physics test chapter 15+16 (2)

1.     Which of the following is produced first

a)     Induced emf

b)    Induced current

c)     Motional emf

d)    None of above

2.     If a closed metallic loop is moved across a magnetic field then

a)     Induced current is produced in it

b)    No induced current is produced

c)     Magnetic will attract the loop

d)    None of these

3.     The phenomenon by which an induced emf is produced in the conductor due to magnetic flux in it is called

a)     Electromagnetism

b)    Electromagnetic induction

c)     Electric polarization

d)    All of the above

4.     The circuit in which current and voltage are in phase, the power factor is

a)     Doubled

b)    Negative

c)     One

d)    Zero

5.     The phase angle between the voltage and the current in an AC circuit consisting of a resistance is

a)     Zero

b)    45⁰

c)     90⁰

d)    180⁰

6.     Pure coke consumes

a)     Minimum power

b)    Maximum power

c)     No power

d)    Average power

7.     Who derived the velocity of Electromagnetic waves

a)     Faraday

b)    Maxwell

c)     Lenz

d)    Einstein

8.     Electromagnetic waves travel in free space with the speed of

a)     gamma-rays

b)    Positive rays

c)     Cathode rays

d)    Β-rays

9.     25 watt and 100 watt bulbs are joined in series and connected to the mains. Which bulb will glow brighter?

a)     100W

b)    25W

c)     First 25W and then 100W

d)    None of these

10.                        For ideal transformer, V_s is _______ proportional to I_s.

a)     Directly

b)    Inversely

c)     Both a and b

d)    None of these

Physics Test Chapter 15+16 (Answer key)

1.d

2.a

3.d

4.b(Ns/Np)

5.c

6.b

7.a

Physics Test Chapter 15+16

1.     Magnetic compass needle will be deflecting, if it is kept near

a)     Static charges

b)    Soft iron

c)     Semi-conductor

d)    Accelerating charges

2.     The alternating current has frequency of 10⁶ Hz, in such a way that time period for completion of cycle is

a)     1µs

b)    1.5µs

c)     10⁶s

d)    1sec

3.     Which of the following device does not function like an electric motor?

a)     Galvanometer

b)    Ammeter

c)     Voltmeter

d)    Transformer

4.     The output voltage of a transformer is 3 times the input voltage, then trans ratio will be

a)     1/3

b)    3

c)     1

d)    6

5.     For long distance transmission, the transformer used is

a)     Step down

b)    Input voltage and output voltage remains same

c)     Step up

d)    Amplifier is used

6.     For parallel resonant circuit, the resonance current is

a)     Zero

b)    Minimum

c)     Maximum

d)    One

7.     In L.C parallel circuit, the coil draws

a)     Leading current

b)    Lagging voltage

c)     Lagging current

d)    Leading voltage

Physics MCQs Chapter 15+16

1.     The value of the steady current, when flowing through the same resistor produces heat at the rate as the mean rate of heat produced by the alternating current , is

a)     Average current

b)    Sinusoidal current

c)     r.m.s current

d)    net current

2.     To find the r.m.s value of an alternating current mathematically, we need to have

a)     Mean value of I²

b)    Square root of mean value of I²

c)     Square root of I²

d)    Square of I/2

3.     An alternating current of r.m.s value of 2A and a steady direct current I following through identical resistors dissipate heat at the same rate. What is the current?

a)     2A

b)     (2) ^½ A

c)     1A

d)    2 (2) ^½ A

1.c

2.b

3.a

Physics MCQs Chapter 15+16

1.     Which of the following uses electric energy and does not convert it into any other form

a)     Transformer

b)    Motor

c)     DC generator

d)    AC generator

2.     The only difference between construction of DC generator and AC generator is that of

a)     Carbon brushes

b)    Coil

c)     Commutator

d)    Magnetic field

3.     If capacitance of L-C circuit is made four times then frequency of the circuit becomes

a)     Twice

b)    One half

c)     Four times

d)    None

1.a

2.c

3.b

Physics MCQs Chapter 15+16

1.     Energy stored in a magnetic field is given by

a)     LI²

b)    L²I/2

c)     LI²/2

d)    IL²

2.     Inductors acts as a short circuit for

a)     Alternating current (AC)

b)    Direct current (DC)

c)     Both A and B

d)    None of these

3.     Eddy currents are used in

a)     Electromagnetic brakes oil

b)    Induction furnace only

c)     Speedometers only

d)    All of these

1.c

2.b

3.d

Physics MCQs Chapter 8+9:

1) Wavelength and time period T are related to the velocity of the wave as

a)    ⋋=T/v

b)   ⋋=v/T

c)    ⋋=Tv

d)   None of these

2) Which of the following medium can transmit both transverse and longitudinal waves

a)    Solids

b)   Liquids

c)    Gases

d)   All of them

3) In the formula for finding the speed of waves in the string, unit of m in SI unit is

a)    Kg

b)   Kg-meter

c)    Kg/meter

d)   Meter/Kg

1.c

2.d

3.c

Physics MCQs: Chapter 8+9

1) In case of standing waves producing in organ pipe, fundamental frequency in case of open pipe is _____ that in case of closed end pipe

a)    Same as

b)   Double than

c)    Half of

d)   All of above have equal chances

2) Which type of organ pipe is richer in harmonics

a)    Open at both ends

b)   Closed at one end

c)    Closed at both ends

d)   None of these

3) The wavelength of sound produced by an open end organ pipe in nth mode is

a)    2ℓ/n

b)   2nℓ

c)    2n+ℓ

d)   None of these

1.b

2.a

3.a