Quiz Tweek

Motion in a plane (NCERT EXEMPLAR)

Test your knowledge on Motion in a plane (NCERT EXEMPLAR) from Physics , Class 11.

30

Minutes

13

Questions

1 / -0

Marking Scheme

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Questions in this Quiz

Q1: The angle between A = i + j and B = i - j is

  • 45°

  • 90°

  • –45°

  • 180°

Q2: Which one of the following statements is true?

  • A scalar quantity is the one that is conserved in a process.

  • A scalar quantity is the one that can never take negative values.

  • A scalar quantity is the one that does not vary from one point to another in space.

  • A scalar quantity has the same value for observers with different orientations of the axes.

Q3: The component of a vector r along X-axis will have maximum value if

  • r is along positive Y-axis

  • r is along positive X-axis

  • r makes an angle of 45° with the X-axis

  • r is along negative Y-axis

Q4: The horizontal range of a projectile fired at an angle of 15° is 50 m. If it is fired with the same speed at an angle of 45°, its range will be

  • 60 m

  • 71 m

  • 100 m

  • 141 m

Q5: Consider the quantities, pressure, power, energy, impulse, gravitational potential, electrical charge, temperature, area. Out of these, the only vector quantities are

  • Impulse, pressure and area

  • Impulse and area

  • Area and gravitational potential

  • Impulse and pressure

Q6: In a two dimensional motion, instantaneous speed v₀ is a positive constant. Then which of the following are necessarily true?

  • The average velocity is not zero at any time.

  • Average acceleration must always vanish.

  • Displacements in equal time intervals are equal.

  • Equal path lengths are traversed in equal intervals.

Q7: In a two dimensional motion, instantaneous speed v₀ is a positive constant. Then which of the following are necessarily true?

  • The acceleration of the particle is zero.

  • The acceleration of the particle is bounded.

  • The acceleration of the particle is necessarily in the plane of motion.

  • The particle must be undergoing a uniform circular motion

Q8: Three vectors A, B and C add up to zero. Find which is false.

  • (A×B) × C is not zero unless B, C are parallel

  • (A×B).C is not zero unless B, C are parallel

  • If A, B, C define a plane, (A×B)×C is in that plane

  • (A×B).C = |A||B||C| → C² = A² + B²

Q9: It is found that |A + B| = |A|. This necessarily implies,

  • B = 0

  • A, B are antiparallel

  • A, B are perpendicular

  • A.B ≤ 0

Q10: Two particles are projected in air with speed v₀ at angles θ₁ and θ₂ (both acute) to the horizontal, respectively. If the height reached by the first particle is greater than that of the second, then tick the right choices

  • angle of projection : θ₁ > θ₂

  • time of flight : T₁ > T₂

  • horizontal range : R₁ > R₂

  • total energy : U₁ > U₂.

...and 3 more questions.

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