Physics Test 117

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Physics Test 117

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Weekly Quiz Competition

Question 1
4 / -1

The velocity of a solid sphere after rolling down an inclined plane of height h, from rest, without sliding is

A

B

C

D
Question 2
4 / -1

A solid sphere rolls without slipping down a 300(from horizontal) incline plane. Its linear acceleration will be

A
5g/14

B
2g/3

C
g/2

D
g/3
Question 3
4 / -1

A planet moves around the sun. At a point P it is closest from the sun at a distance d₁ and has a speed V₁. At another point Q, when it is farthest from the sun at a distance d₂, its speed will be

A
d₁²v₁/d₂²

B
d₂V₁/d₁

C
d₁V₁/d₂

D
d₂²V₁/d₁²
Question 4
4 / -1

The earth retains its atmosphere because

A
The earth is sphere

B
The earth has population

C
The escape velocity < the mean speed of molecules

D
The escape velocity > the mean speed of molecules
Question 5
4 / -1

A solid sphere rolls without slipping and presses a spring of spring constant ‘K’ as in fig. at the moment shown a spring was in relaxed state then the maximum compression in the spring will be

A

B

C

D
Question 6
4 / -1

A particle of mass m = 5 unit is moving with a uniform speed unit in the XOY plane along the line Y=X+4. The magnitude of the angular momentum about origin is:

A
Zero

B
60 units

C
7.5 units

D

Solution

Y=x+4 , x-y-4=0So, perpendicular distance from the origin =4/square root of(1^2+1^2) , =4/square root of 2 now using the law of angular momentum =mvr=5×4/square root of 2×3×square root of 2=60 units.
Question 7
4 / -1

If the earth is at one forth of its present distance from the sun, the duration of the year will be

A
1/2 of present year

B
1/8 of present year

C
1/4 of present year

D
1/6 of present year
Question 8
4 / -1

A wheel of is making 10 revolution per second. It is stopped in 20 Second. Then angular retardation is

A

B

C

D
Question 9
4 / -1

We have two sphere one of which is hollow and the other is solid. They have identical masses and moment of inertia about their respective diameter. The ratio of their radii is

A
5 : 3

B

C

D
1 : 1
Question 10
4 / -1

When a ceiling fan is switched off, its angular velocity falls to half while it makes 36 rotations. How many more rotations will it make before coming to rest if the angular retardation is assumed uniform ?

A
12

B
18

C
24

D
36