141. If a body is in equilibrium under the action of forces, the net force acting on it is
(A) Maximum
(B) Equal to its weight
(C) Proportional to its mass
(D) Zero
142. The unit of pressure in the SI system is
(A) Dyne/cm²
(B) Pascal
(C) N/m
(D) Torr
143. The focal length of a plane mirror is
(A) Zero
(B) Infinite
(C) Equal to its radius of curvature
(D) Not defined
144. The value of acceleration due to gravity (g) is maximum
(A) At the poles
(B) At the equator
(C) At the center of Earth
(D) At the poles
145. The phenomenon of splitting of white light into its component colors is called
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
146. The first law of thermodynamics is based on the principle of
(A) Conservation of mass
(B) Conservation of energy
(C) Conservation of momentum
(D) Conservation of charge
147. An electric current flows in a conductor because
(A) Electrons are stationary
(B) Protons flow from positive to negative
(C) Electrons flow from negative to positive
(D) Neutrons flow in the conductor
148. The force acting on a charged particle in a magnetic field is maximum when
(A) It moves parallel to the field
(B) It moves perpendicular to the field
(C) It moves at 90° to the field
(D) It is at rest
149. Which of the following is a longitudinal wave?
(A) Light waves
(B) Sound waves
(C) X-rays
(D) Radio waves
150. A capacitor stores energy in the form of
(A) Heat energy
(B) Magnetic energy
(C) Electric potential energy
(D) Kinetic energy
151. The speed of light is maximum in
(A) Air
(B) Water
(C) Diamond
(D) Vacuum
152. The dimensions of Planck’s constant are
(A) ML²T⁻¹
(B) MLT⁻²
(C) ML²T
(D) M²L⁻¹T²
153. The range of a projectile depends on
(A) Initial velocity only
(B) Angle of projection only
(C) Both (A) and (B)
(D) Mass of the projectile
154. If the force on a particle moving in a circular path is removed, the particle will
(A) Continue to move in a circular path
(B) Stop immediately
(C) Move tangentially to the circular path
(D) Move radially outward
155. A blackbody is a body that
(A) Reflects all radiation
(B) Absorbs all radiation
(C) Emits all radiation
(D) Both (B) and (C)
156. The SI unit of electric charge is
(A) Ampere
(B) Volt
(C) Ohm
(D) Coulomb
157. What happens to the frequency of light when it enters a denser medium?
(A) Increases
(B) Decreases
(C) Remains the same
(D) Becomes zero
158. A unit vector has
(A) Zero magnitude
(B) Magnitude equal to 1
(C) Magnitude greater than 1
(D) Both (A) and (B)
159. The work done in adiabatic expansion of a gas is
(A) Positive
(B) Negative
(C) Depends on the initial and final states
(D) Zero
160. Which of the following devices works on the principle of electromagnetic induction?
(A) Voltmeter
(B) Ammeter
(C) Transformer
(D) Rheostat
161. The center of gravity of a uniform ring lies
(A) At the center of the ring
(B) At the circumference
(C) On the axis of symmetry
(D) Outside the ring
162. The product of force and time is known as
(A) Work
(B) Energy
(C) Impulse
(D) Power
163. The energy of a photon is proportional to
(A) Wavelength
(B) Frequency
(C) Frequency
(D) Both (A) and (B)
164. The process of converting a solid directly into a gas is called
(A) Condensation
(B) Vaporization
(C) Sublimation
(D) Deposition
165. The spring constant (k) is a measure of
(A) Tension in the spring
(B) Compression of the spring
(C) Stiffness of the spring
(D) Strength of the spring
166. The efficiency of a machine is given by
(A) Work input / Work output
(B) Work output / Work input
(C) Power input / Power output
(D) Force input / Force output
167. The universal gravitational constant (G) has dimensions of
(A) M⁻¹L³T⁻²
(B) MLT⁻²
(C) ML²T⁻²
(D) M⁻²L²T
168. In an elastic collision, the total kinetic energy of the system
(A) Decreases
(B) Increases
(C) Remains constant
(D) Is converted into heat
169. Two waves meet in phase. The resultant amplitude is
(A) Minimum
(B) Maximum
(C) Sum of individual amplitudes
(D) Zero
170. A transformer works on
(A) Direct current
(B) Static electricity
(C) Alternating current
(D) Both AC and DC
171. Which of the following is not a fundamental quantity?
(A) Length
(B) Mass
(C) Time
(D) Energy
172. The boiling point of water decreases when
(A) Atmospheric pressure decreases
(B) Atmospheric pressure increases
(C) Temperature increases
(D) Heat is supplied slowly
173. A projectile has maximum range when projected at
(A) 30°
(B) 45°
(C) 45°
(D) 60°
174. The device used to measure the potential difference is
(A) Ammeter
(B) Galvanometer
(C) Voltmeter
(D) Thermometer
175. Ohm’s law is valid for
(A) Non-linear conductors
(B) Linear conductors
(C) Semiconductors
(D) Diodes
176. The unit of Planck’s constant is
(A) Joule-second
(B) Joule-meter
(C) Newton-second
(D) Joule-second
177. What is the focal length of a lens if its power is +2D?
(A) 0.5 m
(B) 0.5 m
(C) 2 m
(D) 1 m
178. Bernoulli’s principle is based on the conservation of
(A) Mass
(B) Momentum
(C) Energy
(D) Force
179. The SI unit of angular velocity is
(A) Radian
(B) Radian per second
(C) Degree per second
(D) Revolution per second
180. The pressure inside a soap bubble is
(A) Same as atmospheric pressure
(B) Less than atmospheric pressure
(C) Greater than atmospheric pressure
(D) Zero
