# NEET MCQ for Physics 21

NEET MCQ for Physics 21

Q.1.The force per unit charge is known as
A) Electric flux
B) Electric field
C) Electric potential
D) Electric current

Q.2.A diverging lens with magnitude of focal length 25 cm is placed at a distance of 15 cm from a converging lens of magnitude of focal length 20 cm. A beam of parallel light falls on the diverging lens. The final image formed is:
A) Real and at a distance of 40 cm from the divergent lens
B) Real and at a distance of 6 cm from the convergent lens
C) Real and at a distance of 40 cm from convergent lens
D) Virtual and at a distance of 40 cm from convergent lens

Q.3.The temperature of an open room of volume 30 m increases from 17°C to 27°C due to sunshine. The atmospheric pressure in the room remains 1 x 10 Pa. If n; and ne are the number of molecules in the room before and after heating, then ne-n; will
A) 2.5 x 1025
B) -2.5 x 1025
C) -1.61 x 1023
D) 1.38 x 1023

Q.4.A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet of Aluminum. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the 45th division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness of the sheet if the main scale reading is 0.5 mm and the 25th division coincides with the main scale line?
A) 0.50 mm
B) 0.75 mm
C) 0.80 mm
D) 0.70 mm

Q.5.The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is
A) 3V/m
B) 6V/m
C) 9V/m
D) 12V/m

Q.6.What is the unit of magnetic flux?
A) Weber
B) Weber/meter
C) Weber-sec
D) Weber-ampere

Q.7.Two capacitors C1 and C2 are charged to 120 V and 200 V respectively. It is found that by connecting them together the potential on each one can be made zero. Then
A) 5C1 = 3C2
B) 3C1=5C2
C) 3C1 +5C2=0
D) 9C1 = 4C2

Q.8.A force of 49 N is just able to move a block of wood of mass 10 kg on a rough horizontal surface. The coefficient of friction is
A) 0
B) 0.5
C) 0.7
D) 1

Q.9.Working principle of an aeroplane is based on
A) Archimedes Law
B) Pascal’s Law
C) Bernoulli’s Theorem
D) Stoke’s Law

Q.10.Parsec is the unit of
A) Time
B) Distance
C) Frequency
D) Acceleration

Q.11.Of the following properties of a wave, the one that is independent of the other is its
A) Amplitude
B) Velocity
C) Wavelength
D) Frequency

Q.12.On which of the following the jet Engine works?
A) Conservation of energy
B) Conservation of Linear Momentum
C) Conservation of Mass
D) Conservation of Angular momentum

Q.13.The value of acceleration due to gravity is
A) Minimum at equator and maximum at poles
B) Maximum at equator and minimum at poles
C) Equal at poles and equator
D) None of the above

Q.14.Rectifiers are used to convert
A) Direct current to Alternating current
B) Alternating current to Direct current
C) High voltage to low voltage
D) Low voltage to high voltage

Q.15.Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
A) 1.8 km, 0.15 km
B) 2.2 km, 0.20 km
C) 2.8 km, 0.25 km
D) 3.3 km, 0.30 km

Q.16.Optical fiber works on the
A) Principle of refraction
B) Total internal reflection
C) Scattering
D) Interference

Q.17.Mach number is used in connection with the speed of
A) Sound
B) Aircraft
C) Spacecraft
D) Ships

Q.18.Large astronomical telescopes always use as objective
A) Lens
B) Mirror
C) Combinations of lenses
D) None of the above

Q.19.ML 2 T-2 is the dimensional formula for
A) Moment of inertia
B) Pressure
C) Elasticity
D) Couple acting on a body

Q.20.What is the normal temperature of human being on Kelvin scale?
A) 290
B) 300
C) 310
D) 320

Q.21.Two short bar magnets of length 1 cm each have magnetic moments 1.20 Am2 and 1.00 Am2respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0 cm. The value of the resultant horizontal magnetic induction at the mid-point of the line joining their centre is close to (Horizontal component of earth’s magnetic induction is 3.6 x 10-5Wb/m2)
A) 3.6 x 10-5 Wb/m2
B) 2.56 x 10-4 Wb/m2
C) 3.50 x 10-4 Wb/m2
D) 5.80 x 10-4 Wb/m2

Q.22.A train is moving on a straight track with speed 20 ms-1 It is blowing its whistle at the frequency of 1000 Hz. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound = 320 ms-1) close to
A) 6%
B) 12 %
C) 18 %
D) 24%

Q.23.Who was the first scientist to be awarded two Nobel Prizes?
A) Linus Pauling
B) Frederick Sanger
C) Marie Curie
D) John Bardeen

Q.24.Which among the following sentence is correct reason behind the blue color of ocean water?
A) Water molecules absorb all other colors except blue
B) Impurities in Sea water reflect the blue light
C) Water molecules scatter the blue light
D) None of the above

Q.25.Which among the following would be most commonly affected, if the filament of a electric Bulb is not uniform?
A) Light
B) Life
C) Resistance
D) None of the above