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Vector JEE physics - Vector

CBSE - STD 12 Science - JEE physics (CBSE - English Medium). 200 questions in this chapter.

Question types

Vector question types

200 questions across 2 question groups — pick any mix to generate a JEE physics paper with step-by-step answer keys.

200
Questions
2
Question groups
5
Question types
Sample Questions

Vector questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 2Assertion & Reason1 Mark
Assertion : If $\vec{A} \cdot \vec{B}=\vec{B} \cdot \vec{C}$, then $\vec{A}$ may not always be equal to $\vec{C}$
Reason : The dot product of two vectors involves cosine of the angle between the two vectors.
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Q 3Assertion & Reason1 Mark
Assertion : The minimum number of non coplanar vectors whose sum can be zero, is four.
Reason : The resultant of two vectors of unequal magnitude can be zero.
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Q 5Assertion & Reason1 Mark
Assertion $\quad$ : If dot product and cross product of $\vec{A}$ and $\vec{B}$ are zero, it implies that one of the vector $\vec{A}$ and $\vec{B}$ must be a null vector.
Reason $\quad$ : Null vector is a vector with zero magnitude.
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Q 6MCQ1 Mark
A vector $\vec{A}$ points vertically upward and $\vec{B}$ points towards north. The vector product $\vec{A} \times \vec{B}$ is
  • A
    Zero
  • ✓
    Along west
  • C
    Along east
  • D
    Vertically downward

Answer: B.

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Q 7MCQ1 Mark
A truck travelling due north at $20 m / s$ turns west and travels at the same speed. The change in its velocity be
  • A
    $40 m / s N-W$
  • B
    $20 \sqrt{2} m / s N-W$
  • C
    $40 m / s S-W$
  • ✓
    $20 \sqrt{2} m / s S-W$

Answer: D.

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Q 8MCQ1 Mark
If the resultant of $n$ forces of different magnitudes acting at a point is zero, then the minimum value of $n$ is
  • A
    1
  • B
    2
  • ✓
    3
  • D
    4

Answer: C.

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Q 9MCQ1 Mark
The vector projection of a vector $3 \hat{i}+4 \hat{k}$ on $y$-axis is
  • A
    5
  • B
    4
  • C
    3
  • ✓
    Zero

Answer: D.

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Q 10MCQ1 Mark
A plane is revolving around the earth with a speed of $100 km / hr$ at a constant height from the surface of earth. The change in the velocity as it travels half circle is
  • ✓
    $200 km / hr$
  • B
    $150 km / hr$
  • C
    $100 \sqrt{2} km / hr$

Answer: A.

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