Waves And Motions(General Knowledge > General Science ) Questions and answers for exam Preparation

General Knowledge > General Science

WAVES AND MOTIONS MCQs

Laws Of Motion, Second Law Motion, Uniform Circular Motion, First Law Of Motion, Third Law Motion, Horizontal Projectile Motion, Oscillations And Waves, Radio Wave Propagation, Wave Optics

Total Questions : 131 | Page 8 of 14 pages

Question 71. Which angle will produce the greatest range (in the absence of air resistance)?

0 degrees
45 degrees
90 degrees
none of these

Discuss Question

Answer: Option B. -> 45 degrees

Question 72. The landing velocity is ____

only on the x axis.
only on the y axis.
on both the x and y axis,
on either the x or y axis.

Discuss Question

Answer: Option C. -> on both the x and y axis,

Question 73. An object is projected horizontally from a cliff

more than if it was just dropped
less than if it was just dropped
the same amount of time than if it was just dropped
impossible to determine

Discuss Question

Answer: Option C. -> the same amount of time than if it was just dropped

Question 74. In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves

True
False
Sometimes true
Sometimes false

Discuss Question

Answer: Option A. -> True

Question 75. Projectile A is fired with a velocity of 20 m/s while projectile B is fired with a velocity of 40 m/s from the same height

Projectile B goes half as far as projectile A,
Projectile B goes twice as far as projectile A.
Projectile B goes the same range as projectile A.
Can not be compared.

Discuss Question

Answer: Option B. -> Projectile B goes twice as far as projectile A.

Question 76. What is the height of a horizontal projectile if it takes 3 seconds to hit the ground?

3.00 m
29.4 m
44.1 m
88.3 m

Discuss Question

Answer: Option C. -> 44.1 m

Question 77. A horizontal shifts move a function

up or down
left or right

Discuss Question

Answer: Option B. -> left or right

Question 78. A horizontally-launched projectile arcs out and hits the ground below

d→x=v→x⋅t\overrightarrow{d}_x=\overrightarrow{v}_x\cdot tdx=vx⋅t
d→y=+12⋅g⋅t2+v→yi⋅t\overrightarrow{d}_y=+\frac{1}{2}\cdot g\cdot t^2+\overrightarrow{v}_{yi}\cdot tdy=+21⋅g⋅t2+vyi⋅t
v→yf=v→yi+g⋅t\overrightarrow{v}_{yf}=\overrightarrow{v}_{yi}+g\cdot tvyf=vyi+g⋅t
t=2⋅d→ygt=\sqrt{\frac{2\cdot\overrightarrow{d}_y}{g}}t=g2⋅dy

Discuss Question

Answer: Option D. -> t=2⋅d→ygt=\sqrt{\frac{2\cdot\overrightarrow{d}_y}{g}}t=g2⋅dy

Question 79. At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height

Neither- they hit at the same time
the horizontally thrown ball
the dropped ball
None of these

Discuss Question

Answer: Option A. -> Neither- they hit at the same time

Question 80. Projectile A is fired with a velocity of 20 m/s off a 20 m cliff, while projectile B is fired with a velocity of 40 m/s off a 10m cliff