A body moves with uniform acceleration. The graph between velocity and time is: MCQ with Answer and Explanation

A body moves with uniform acceleration. The graph between velocity and time is:
A. Straight line parallel to time axis
B. Hyperbola
C. Parabola
D. Straight line with positive slope
Answer: Option D
Solution (By JKSSB Mock Tests)
Uniform acceleration means constant rate of change of velocity: a = dv/dt = constant. Thus v = u + at, a linear equation in t. Graph is straight line with slope = acceleration. Parallel to time axis (A) implies zero acceleration (constant velocity). Parabola (C) is for position-time under constant acceleration. Memory tip: 'v-t graph slope = acceleration; area = displacement'. This graph interpretation question tests kinematics fundamentals, frequently examined in competitive exams. Always link graph features to physical quantities: slope, area, intercepts have specific meanings in motion graphs.

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Question #1
In a potentiometer, the sensitivity can be increased by:
A. Decreasing the length of the wire
B. Increasing the current in the primary circuit
C. Increasing the length of the wire
D. Using a thicker wire

Correct Answer: Option C


Explanation:
Potentiometer sensitivity (ability to detect small EMF changes) increases with longer wire because potential gradient (V/cm) decreases, allowing finer measurement of balancing length. Sensitivity ∝ length of wire. Decreasing length (B) reduces sensitivity; increasing current (C) increases potential gradient, reducing sensitivity; thicker wire (D) reduces resistance but doesn't directly affect sensitivity if current adjusted. Memory tip: 'Longer potentiometer wire ⇒ smaller potential gradient ⇒ higher sensitivity'. This experimental physics concept is frequently tested in competitive exams. Always link sensitivity to potential gradient: smaller gradient allows detection of smaller voltage differences.

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Question #2
The scientist who invented the telephone was
A. Bell
B. Marconi
C. Tesla
D. Edison

Correct Answer: Option A


Explanation:
Alexander Graham Bell patented telephone in 1876.

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The gravitational constant G has dimensions
A. [M⁻¹L³T⁻¹]
B. [M⁻¹L³T⁻²]
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Correct Answer: Option B


Explanation:
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