# NEET MCQ for Physics 20

NEET MCQ for Physics 20

Q.1.During the propagation of electromagnetic waves in a medium
A) Electric energy density is equal to the magnetic energy density.
B) Both electric and magnetic energy densities are zero.
C) Electric energy density is double of the magnetic energy density.
D) Electric energy density is half of the magnetic energy density.

Q.2.A closed system is one in which
A) Mass does not cross boundaries of the system, though energy may do so
B) Energy does not cross boundaries of the system, though mass may do so
C) Neither mass nor energy crosses the boundaries of the system
D) Both energy and mass cross the boundaries of the system

Q.3.The velocity of a body depends on time as v=20 +0.1t2. The body is undergoing
A) Uniform acceleration
B) Uniform retardation
C) Non-uniform acceleration
D) Non-uniform retardation

Q.4.A capacitance of 2uF is required in an electrical circuit across a potential difference of 1 kV. A large number of 1 uF capacitors are available which can withstand a potential difference of not more than 300 V. The minimum number of capacitors required to achieve this is :
A) 24
B) 32
C) 2
D) 16

Q.5.Diameter of a Plano – convex lens is 6 cm and thickness at the centre is 3 mm. If speed of light in material of lens is 2 x 10 m/s, the focal length of the lens is
A) 15 cm
B) 20 cm
C) 30 cm
D) 10 cm

Q.6.Which of the following is an instrument for measuring electric charge or electrical potential difference?
A) Ammeter
B) Voltmeter
C) Electrometer
D) Ohmmeter

Q.7.Which among the following character of mercury makes it suitable to use in barometers instead of water?
A) Low density and low vapor pressure
B) High density and high vapor pressure
C) Low density and good conductor of heat
D) High density and low vapor pressure

Q.8.When two mercury drops are brought into contact they form a single bigger drop to get which of the following?
A) Minimum volume
B) Minimum surface area
C) Maximum size
D) Maximum surface area

Q.9.Which among the following property of the matter is studied in “Rheology”?
A) Gravitation
B) Viscosity
C) Magnetic Properties
D) Entropy

Q.10.First steam-powered vehicle was built by?
A) Richard Trevithick
B) Nicolas-Joseph Cugnot
C) Don Walsh
D) Janice Meek

Q.11.The name of Robert Watson-Watt is associated with which among the following inventions?
A) Steam Engine
B) Electric Bulb
D) Microwaves

Q.12.Which of the following is India’s first nuclear reactor?
A) Apsara
B) Dhruva
C) Rawatbhatta
D) Kudankulam

Q.13.Thin lamination is used in a transformer to reduce:
A) Eddy current losses
B) Hysteresis losses
C) Corona losses
D) None of the above

Q.14.The absorption of ink by blotting paper involves
A) Viscosity of ink
B) Capillary action phenomenon
C) Diffusion of ink through the blotting
D) Siphon action

Q.15.Pa(Pascal) is the unit for
A) Thrust
B) Pressure
C) Frequency
D) Conductivity

Q.16.Superconductors are substances which
A) Conduct electricity at low temperature
B) Offer high resistance to the flow of current
C) Offer no resistance to the flow of electricity
D) Conduct electricity at high temperatures

Q.17.Identify the vector quantity from the following
A) Heat
B) Angular momentum
C) Time
D) Work

Q.18.Materials for rain-proof coats and tents owe their water-proof properties to
A) Surface tension
B) Viscosity
C) Specific gravity
D) Elasticity

Q.19.Of the following natural phenomena, tell which one known in Sanskrit as deer’s thirst?
A) Rainbow
B) Earthshine
C) Halo
D) Mirage

Q.20.Which of the following factors affect the elasticity?
A) Hammering and Annealing
B) Change in temperature
C) Mixing impurities
D) All of the above

Q.21.The number of significant figures in 30.00 m are
A) 1
B) 2
C) 3
D) 4

Q.22.Who was the inventor of lightning conductor?
A) Benjamin Franklin
B) Einstein
C) Lord Lister
D) Graham Bell

Q.23.Two Flat mirrors are placed at an angle of 60° from each other. How many images will be formed of a Candle placed in between them?
A) 3
B) 4
C) 5
D) 6

Q.24.Who among the following coined the term “cosmic rays”?
A) Henri Becquerel
B) Theodor Wulf
C) Robert Millikan
D) Bruno Rossi

Q.25.Fermi-Kurie plot is used for the study of which of the following?
A) Alpha Decay
B) Beta Decay
C) Internal Conversion
D) Cluster Decay