NEET Physics: Scalars and Vectors Practice Questions
15 free multiple-choice questions on Scalars and Vectors (Kinematics) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. If two vectors have the same magnitude but opposite directions, their resultant vector will be:
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Correct answer: B — Zero
If two vectors have equal magnitude but opposite directions (e.g., A⃗ and -A⃗), their resultant vector is the zero vector, as their components cancel out.
Q2. If two vectors are added together, the resulting quantity is always a:
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Correct answer: A — Vector quantity
The sum of two vectors results in a new vector, as directionality is preserved during vector addition. Scalar quantities are added arithmetically.
Q3. The magnitude of a vector represents which property?
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Correct answer: B — The size or amount
The magnitude of a vector is its size or amount, which is the numerical value of the vector, irrespective of its direction.
Q4. The change in position of an object is an example of a:
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Correct answer: D — Vector quantity
Change in position, or displacement, is a vector quantity because it specifies both the amount of change and the direction of change.
Q5. If two vectors acting on a particle are equal in magnitude and opposite in direction, what is the resultant vector?
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Correct answer: B — Zero
When two vectors are equal in magnitude and opposite in direction (antiparallel), their resultant vector is the zero vector.
Q6. The magnitude of the resultant of two perpendicular vectors is given by:
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Correct answer: D — The product of the magnitudes
If two vectors are perpendicular, the magnitude of their resultant vector is found using the Pythagorean theorem, which is related to the dot product (magnitude calculation).
Q7. If two quantities, A and B, are scalars, then the sum (A+B) must also be a scalar. This property is known as:
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Correct answer: D — Commutative Law
Scalar addition follows the standard laws of arithmetic, meaning the sum of two scalars is always a scalar.
Q8. If two vectors are equal in magnitude but opposite in direction, their resultant vector sum is:
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Correct answer: A — Zero vector
If two vectors are equal in magnitude and opposite in direction, they cancel each other out, resulting in a zero vector.
Q9. The quantity that has both magnitude and direction is known as a:
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Correct answer: C — Vector
A vector quantity is defined as a physical quantity that requires both magnitude and a specific direction for its complete description.
Q10. If the magnitude of a vector A⃗ is 5 units and its direction is 30° above the positive x-axis, what is the vector quantity?
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Correct answer: A — A vector with magnitude 5 and direction 30°
A vector requires both magnitude and direction to be fully described. The option correctly defines the vector as having both properties.
Q11. If two vectors are given, the sum of the two vectors must be a:
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Correct answer: A — Vector quantity
The sum of two vectors (vector addition) results in a new vector quantity, which has both magnitude and direction.
Q12. The dot product of two vectors always results in a:
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Correct answer: B — Scalar quantity
The dot product (A⃗ · B⃗ = |A⃗||B⃗|cos θ) results in a scalar quantity, which measures the projection of one vector onto another.
Q13. If two vectors are perpendicular to each other, what is the angle between them?
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Correct answer: C — 90°
If two vectors are perpendicular (orthogonal), the angle measured between them is 90 degrees.
Q14. Which of the following physical quantities is a scalar quantity?
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Correct answer: D — Distance
Distance and mass are scalars. Distance measures the total path covered, and mass is a scalar quantity (magnitude only). Displacement and velocity are vectors, as they require direction.
Q15. Which of the following is a scalar quantity?
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Correct answer: B — Energy
Energy and position (in the context of a single point) are scalars. Momentum and velocity are vectors because they involve direction.
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