UHS MDCAT Past Paper 2022

161- Which surface has greater magnetic flux in same magnetic field, each has an area 1 m².

A. Circular
B. Rectangular
C. Triangular
D. All have same flux

Answer : D. All have same flux

162- A charged particle is moving in a uniform magnetic field. For the motion of the particle due to the field, which quantity has a constant non-zero value?

A. acceleration
B. displacement
C. rate of change of acceleration
D. velocity

Answer : D. velocity

163- The magnetic field inside a solenoid is:

A. Zero
B. Uniform
C. Non-uniform
D. Strong at the ends

Answer : B. Uniform

164- The magnetic field of a current carrying conductor is due to:

A. motion of electrons
B. motion of protons
C. motion of neutrons
D. motion of ions

Answer : A. motion of electrons

165- A transformer has 100 turns in the primary coil and 200 turns in the secondary coil. The primary coil is connected to a 6 V battery. The voltage in the secondary coil would be:

A. 3 V
B. 6 V
C. 9 V
D. 12 V

Answer : D. 12 V

166- A step up transformer has a turn ratio of 1:100. An alternating voltage of amplitude 20 V is connected to the primary. The amplitude of secondary voltage is:

A. 2 V
B. 20 V
C. 200 V
D. 2000 V

Answer : D. 2000 V

167- Which of the following is the SI unit of magnetic induction?

A. Tesla
B. Weber
C. Henry
D. Gauss

Answer : A. Tesla

168- When a charged particle moves in a magnetic field, its kinetic energy:

A. increases
B. decreases
C. remains constant
D. becomes zero

Answer : C. remains constant

169- A 100 W lamp is operated by 240 V a.c mains. The peak value of current is:

A. 0.42 A
B. 0.59 A
C. 0.72 A
D. 1.18 A

Answer : B. 0.59 A

170- The value of alternating current is measured by:

A. hot wire ammeter
B. moving coil galvanometer
C. tangent galvanometer
D. ballistic galvanometer

Answer : A. hot wire ammeter

171- The value of current at resonance in RLC series circuit is:

A. maximum
B. minimum
C. zero
D. infinite

Answer : A. maximum

172- The velocity of light was determined accurately by:

A. Newton
B. Roemer
C. Huygens
D. Michelson

Answer : D. Michelson

173- The speed of light in vacuum is:

A. 3 × 10⁶ m/s
B. 3 × 10⁵ m/s
C. 3 × 10⁸ m/s
D. 3 × 10¹⁰ m/s

Answer : C. 3 × 10⁸ m/s

174- The critical angle for a beam of light passing from a diamond into the air is 24.4°. This means that any light rays that strike the surface interface at an angle greater than 24.4° will be:

A. completely reflected
B. partially reflected and partially refracted
C. completely absorbed
D. completely transmitted

Answer : A. completely reflected

175- The refractive index of water is 1.33. What will be the speed of light in water?

A. 3 × 10⁸ m/s
B. 2.26 × 10⁸ m/s
C. 4 × 10⁸ m/s
D. 1.33 × 10⁸ m/s

Answer : B. 2.26 × 10⁸ m/s

176- A convex lens has a focal length f. An object is placed at a distance between f and 2f on a line perpendicular to the center of the lens. The image formed is located at what distance from the lens?

A. between f and 2f
B. between 2f and infinity
C. between the lens and f
D. at 2f

Answer : B. between 2f and infinity

177- A lens has a power of +5 diopters. What is the focal length of the lens?

A. 0.2 m
B. 0.5 m
C. 2 m
D. 5 m

Answer : A. 0.2 m

178- In Young's double slit experiment, the fringe spacing for light of wavelength 500 nm is 2.0 mm. The fringe spacing becomes 1.0 mm when the wavelength of light used is changed to:

A. 250 nm
B. 500 nm
C. 750 nm
D. 1000 nm

Answer : A. 250 nm

179- The resolving power of a telescope can be increased by increasing the:

A. focal length of the objective
B. focal length of the eyepiece
C. aperture of the objective
D. aperture of the eyepiece

Answer : C. aperture of the objective

180- An electron of charge e coulomb passes through a potential difference of V volts. Its energy in joules will be:

A. V/e
B. eV
C. e/V
D. V

Answer : B. eV

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