PhysicalGeneral Knowledge English Speaking/Writing Computer Skill SSC Railways State Level Teaching

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Question1) Which of the these physical quantities is a vector quantity?

[A] Temperature

[B] Speed

[C] Gravitational Intensity

[D] Work

Option- ['A', 'B', 'C', 'D']

Answer: C

Explaination: Correct Answer: C [Gravitational Intensity]

Notes:

The physical quantities which have both magnitude and direction are called as Vector quantities. Some examples of Vector quantities: Acceleration, Velocity, Torque, Displacement, Gravitational Intensity, Force.

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Question2) What is the relation between velocity and acceleration at the highest point of projectile path?

[A] both are at an angle of 45° to each other

[B] both are perpendicular to each other

[C] both are at an angle of 180° to each other

[D] None of the above

Option- ['A', 'B', 'C', 'D']

Answer: B

Explaination: Correct Answer: B [both are perpendicular to each other]

Notes:

At the highest point of projectile path, the velocity and acceleration are perpendicular to each other. At the highest point of projectile path, the projectile possesses velocity only along the horizontal direction.

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Question3) Which of the following statements regarding vectors is NOT correct?

[A] A unit vector is dimensionless

[B] A vector cannot be divided by a vector

[C] A vector changes, when it is displaced to itself

[D] Current is not a vector quantity

Option- ['A', 'B', 'C', 'D']

Answer: C

Explaination: Correct Answer: C [A vector changes, when it is displaced to itself]

Notes:

A unit vector is unit less and dimensionless. A vector cannot be divided by a vector as a vector cannot be divided by a direction. A vector does not change, when it is displaced to itself. Time, Pressure, Surface Tension, Current are some of the quantities that have direction but are not vectors. A physical quantity is a vector only when it follows commutative law of addition of vectors.

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Question4) When one body is actually moving over the surface of other body, the friction is known as:

[A] Kinetic friction

[B] Limiting friction

[C] Static friction

[D] Negative friction

Option- ['A', 'B', 'C', 'D']

Answer: A

Explaination: Correct Answer: A [Kinetic friction]

Notes:

When one body is actually moving over the surface of other body, the friction is known as Kinetic friction. It is also known as dynamic friction.

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Question5) 35. As per the Newton’s second law of motion, what is the relation between the rate of change of linear momentum and the external force applied?

[A] directly proportional

[B] inversely proportional

[C] independent of each other

[D] None of the above

Option- ['A', 'B', 'C', 'D']

Answer: B