Physics Test 73

Result

Physics Test 73

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Weekly Quiz Competition

Question 1
4 / -1

The equation of a projectile is y = 16x – x²/4. the horizontal range is :

A
16 m

B
8 m

C
64 m

D
12.8 m

Solution
Question 2
4 / -1

A ball is thrown horizontally from a height of 20m. It hits the ground with a velocity three times its initial velocity. The initial velocity of ball is :-

A
2 m/s

B
3 m/s

C
5 m/s

D
7 m/s

Solution

2gh + v_x² = v²
∵ v = 3v_x
2gh + v_x² = 9v_x²
v_x = 7 m/s
Question 3
4 / -1

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

A
60 m

B
71 m

C
100 m

D
141 m

Solution

We know that,
where, θ is angle of projection
Given, θ = 15^o and R = 50 m
Question 4
4 / -1

A ball is thrown vertically upwards with an initial velocity of 5 m/sec from point P as shown. Q is point 10 m vertically below the point P. Then the speed of the ball at point Q will be : (take g = 10 m/s²and neglect air resistance)

A
7.5 m/sec

B
10 m/sec

C
15 m/sec

D
17.5 m/sec

Solution

v¹ = u² + 2 as
v² = (5)² + 2 × 10 × 10
v² = 25 + 200 ⇒ 225
v = 15 m/sec
Question 5
4 / -1

A person, reaches a point directly opposite on the other bank of a flowing river, while swimming at a speed of 5 m/s at an angle of 120^o with the flow. The speed of the flow must be :-

A
2.5 m/s

B
3 m/s

C
4 m/s

D
1.5 m/s

Solution
Question 6
4 / -1

A man can swim at a speed of 3 km/hr in still water. He wants to cross a 500 m wide river flowing at 2 km/hr. He keeps himself at an angle 120º with river flow while swimming. the time taken to cross the river is :-

A
3/2 hr

B
1/6 hr

C

D
None

Solution
Question 7
4 / -1

A particle is thrown vertically upwards & it returns to the starting point after 10 sec. then its location after 7 sec. will be same as that after.

A
1 sec.

B
2 sec.

C
3 sec.

D
4 sec.

Solution
Question 8
4 / -1

A particle's velocity changes from m/s, to m/s in 2 sec then acceleration of particle is :-

A

B

C
0

D

Solution
Question 9
4 / -1

In a car race car A takes 't₀' time less to finish than car B and passes the finishing point with velocity V₀ more than car B. The cars start from rest and travel. with constant acceleration a₁ & a₂. Then the ratio is equal to :-

A

B

C

D

Solution
Question 10
4 / -1

In 1-D motion due to constant positive acceleration :-

A
Speed may increase or decrease

B
Speed is zero

C
Speed must increase

D
None of the above

Solution

If velocity is in positive direction, along with acceleration then speed increases. If velocity is negative direction, opposite to acceleration then speed decreases.