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Class 7
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Physics
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Motion and Time
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Hard Questions
Motion And Time
Physics
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Hard Qs
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Two cyclists, k km apart, and starting at the same time, would be together In r hours if they travelled in the same direction, but would pass each other In t hours if they travelled in opposite directions. The ratio of the speed of the faster cyclist to that of the slower is ____
A
r
−
t
r
+
t
B
r
−
t
r
C
r
r
+
t
D
t
r
Hard
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Speed-distance graph of an object in uniform motion which comes to rest suddenly is
A
B
C
D
Hard
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>
Match the situations given in column I with the possible curves in column II and select the correct option, from codes given
A
(a)
→
(q), (b)
→
(8), (c)
→
(p). (d)
→
(r)
B
(a)
→
(s,r). (b)
→
(q), (c)
→
(s), (d)
→
(p)
C
(a)
→
(q,s); (b)
→
(r), (c)
→
(p), (d)
→
(s)
D
(a)
→
(s), (b)
→
(q,p), (c)
→
(s), (d)
→
(r)
Hard
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>
A rod of length/leans by its upper end against a smooth vertical wall while its other end leans against the floor. The end that leans against the wall moves uniformly downwards. Then:
A
The other end also moves uniformly.
B
The speed on other end goes on increasing.
C
The speed on other end goes on decreasing.
D
The speed on other end first decreasing and then increasing.
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In a damped oscillator, the mass of the oscillator is m = 200g, force constant is K = 90N/m and the damping constant b is 40 g/s. Find the time taken for its mecharical energy to drop to half its initial value
A
0.3s
B
0.208 s
C
6.93s
D
3.46s
Hard
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>
Give Reasons for the following:
If the reading on the odometer of a vehicle in the beginning of a trip and after
4
0
minutes were
1
0
4
8
k
m
and
1
0
9
6
k
m
respectively, will the reading on the speedometer show this velocity where the vehicle is moving? Support your answer with reason.
Hard
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What does an odometer do?
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The speed of a bus is 72 km/h, whereas the speed of a car is 125 m/s. Which vehicle moves faster?
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a
. A boy moving on a bicycle with a speed of
1
8
k
m
/
h
.
b
. A fast runner running with a speed of
1
0
m
/
s
.
c
. A scooter moving with a speed of
8
0
0
m
/
m
i
n
.
A
c
>
b
>
a
B
b
>
c
>
a
C
a
>
b
>
c
D
c
>
a
>
b
Hard
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>
Unit of Time is:
A
Metre
B
Kilometre
C
Second
D
None of these
Hard
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>