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Quiz 8
Mdcat-past-papers - IBA Quiz
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Board: IBA |
141. Consider these two vectors A=2i+3j and B=-6i+4j. The angle between these two vectors is:
0°
90°
120°
180°
142. A displacement time graph is a straight line inclined up at angle of 45° with X-axis, velocity of body according to this graph is:
Increasing
Decreasing
Constant
Decreasing at start and then may decrease
143. A 150 kg car has its velocity reduced from 20 m/s to 10 m/s in 3.0 sec. How large was the average retarding force?
500 N
2500 N
1500 N
1000 N
144. The phenomenon of interference of sound waves requires:
Two sources with different frequencies
Two coherent sources
A single source
A single source and a reflecting surface
145. A gas expands from 1 m³ to 3 m³ at constant pressure of 2 Pa. Work done is:
2J
4J
6J
8J
146. If frequency of AC is doubled, the inductive reactance will:
Remain same
Be halved
Be doubled
Become zero
147. The force between two charges is 28 N in vacuum. If paraffin wax of relative permittivity 2.8 is introduced between the charges as a medium, then the force reduces to:
25 N
20 N
15 N
10 N
148. A body moves along a semicircular path of radius 10 m from one end of the diameter to the other. The ratio of distance to displacement is:
π:1
1:π
π:2
2:π
149. A body is projected with speed v making an angle 0 with the horizontal and covers horizontal range R. If its speed is doubled, the new range will be:
R/2
R
2R
4R
150. A ball of mass m strikes a wall and rebounds with the same speed in the opposite direction, taking the initial direction as positive, the change in the momentum of the ball is:
0
mv
-2mv
-mv
151. A point lies 3m from a +5μC charge and 4m from a -3μC charge. The most appropriate direction of the net electric field at this point is directed:
Away from +5μC charge
Towards +5μC charge
Away from the -3μC charge
Perpendicular to the line joining the charges
152. The increase in kinetic energy associated with decreased pressure of a fluid in a horizontal pipe is a consequence of the:
Bernoulli's Principle
Equation of continuity
Pascal's principle
Torricelli's theorem
153. The electric field at a point due to a point charge is 200N/C. If suppose a -4C test charge is placed at that point then the magnitude of electric field and electric force on it is:
200N/C and 50N
200N/C and 200N
200N/C and 800N
800N/C and 800N
154. Internal resistance reduces the terminal voltage because it:
Produces back emf
Causes power loss inside the battery
Increases the current
Decreases the emf
155. The angle formed at the center of a circle as a body moves from one position to another is:
Angular displacement
Angular velocity
Angular acceleration
Angular momentum
156. During the drilling of a metal surface the drill bit heats up. This heat comes from the:
Vibration of the tool
Work done against friction
Flow of electric current
Compression of air
157. If 2J of work is done in moving two coulombs of charge from one point to the other in an electric field. The potential difference between the points is:
1 J/C
2 J/C
1 J/C
2 J/C
158. The motion of transverse waves involves particle's vibration:
Along the wave direction
Opposite to energy flow
Perpendicular to wave propagation
In random direction at every point
159. In laminar flow of fluid, its adjacent layers:
Resist each other
Mix with each other
Slide smoothly pass each other
Produce turbulence
160. A body moving in a circle, half revolution in terms of radians is equivalent to:
π
π/6
π/2
2π
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