Impulse of a force is equal to ____
Correct answer D. the change in momentum of the body
Subject / 480 questions
MDCAT ECAT Physics MCQs
Page 23 of MDCAT ECAT Physics multiple-choice questions with answers. Tap an option to check yourself.
Page 23 of 24
- Electromagnetic Induction 30
- Fluid Dynamics 30
- Electrostatics 30
- Electronics 30
- Electromagnetism 30
- Current Electricity 30
- Work and Energy 30
- Waves 30
- Vectors and Equilibrium 30
- Nuclear Physics 30
- Dawn of Modern Physics 30
- Thermodynamics 30
- Rotational and Circular Motion 30
- Atomic Spectra 30
- Alternating Current 30
- Force and Motion 30
Which quantities are conserved in a perfectly elastic collision?
Correct answer C. Both momentum and kinetic energy
What is the characteristic of a perfectly inelastic collision?
Correct answer A. The bodies stick together and move with a common velocity
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In a one-dimensional elastic collision between two bodies, which statement is correct?
Correct answer B. Relative speed of approach equals relative speed of separation
A ball moving with speed u makes an elastic head-on collision with an identical ball at rest. What happens after the collision?
Correct answer B. The first ball stops and the second moves with speed u
A bomb at rest explodes into two fragments. How do the fragments move?
Correct answer D. In opposite directions with equal magnitudes of momentum
Why do the action and reaction forces of Newton’s third law not cancel each other?
Correct answer B. They act on different bodies
A vector has rectangular components Aₓ = 6 units and Aᵧ = 8 units. What is its magnitude and direction from the x-axis?
Correct answer C. 10 units at 53.1°
If A = 3î + 4ĵ and B = 2î − ĵ, what is A·B?
Correct answer C. 2
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If A = 2î + 3ĵ and B = 4î + ĵ, what is A × B?
Correct answer C. −10k̂
Two vectors of magnitudes 5 units and 4 units are inclined at 60°. What is their scalar product?
Correct answer D. 10 units²
Two vectors of magnitudes 6 units and 5 units make an angle of 30°. What is the magnitude of their vector product?
Correct answer A. 15 units²
What is the angle between the vectors A = î + ĵ and B = î?
Correct answer C. 45°
A force F = (3î + 4ĵ) N displaces a body by d = 5î m. How much work is done?
Correct answer B. 15 J
If A = 4î − 2ĵ and B = −î + 6ĵ, what is the magnitude of A + B?
Correct answer C. 5 units
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What is the area of the parallelogram whose adjacent sides are A = 3î m and B = (2î + 4ĵ) m?
Correct answer B. 12 m²
For what value of a are the vectors A = 2î + aĵ and B = 3î − 6ĵ perpendicular?
Correct answer C. 1
A force F = 3ĵ N acts at a point with position vector r = 2î m from the axis. What is the torque?
Correct answer C. 6k̂ N m
What does the slope of a displacement-time graph represent?
Correct answer A. Velocity
A runner completes one full lap of a circular track and returns to the starting point. What is the average velocity for the lap?
Correct answer D. Zero