Sample Paper Physics Class 9
(i) (b) for measuring the inner diameter
Inside jaws are used to measure the internal diameter of a hollow cylinder or pipe.
(ii) (c) x / n
1 MSD = x cm
n VSD = (n – 1) MSD
∴ 1 VSD = ((n-1)/2) MSD
∴ L.C. = 1 MSD – 1 VSD
= 1 MSD –((n-1)/2) MSD
= n-(n-1)/n MSD
1 MSD = x cm
L. C. = x/n cm
(iii) (b) 2 R
Total time of motion on circular track
= 2 × 60 + 20 = 140 s.
Time period of revolution = 40 s. Therefore displacement in time = (3 × 40 = 120 s) = zero as athlete will
be reaching at the starting point.
(v) (d) mv
Use momentum = mass × linear velocity shift to numerical section.
(vi) (c) impulse of force
Since, impulse is calculated as the product of force and time the unit Ns is defining the quantity impulse.
(vii) (c) Hydraulic turbine
Hydraulic turbine does not follow the principle of a hydraulic machine. It works on the speed of flow of
(viii) (a) Vertically above its centre of gravity
For stable equilibrium the centre of buoyancy should be vertically above its centre of gravity so that it does not sink.
(ix) (d) Photosynthetic plants
The producers (photosynthetic plants) synthesize organic substances by the process of photosynthesis (i.e., they bind the simple compounds with the help of solar energy into the complex organic substances).
(x) (c) Hope’s experiment
In 1805, the scientist T.C. Hope derived a simple arrangement, known as Hope’s apparatus for
demonstrating the anomalous expansion of water.
(xi) (c) 60°
The situation is shown in figure.
(xii) (b) 30 cm
Here, f = – 20 cm, m = – 2 ( image is real)
m = − v /u , v = – mu = 2u
we get, =1/u+1/2u=-1/20
or 3/2u=-1/20 or u = – 30 cm
(xiii) (b) 3.4 km
Distance of thunder cloud
= Speed of sound × time
= 340 × 10
= 3400 m = 3.4 km
(xiv) (b) 4950 C
Current =Electric charge/Time
0.55=Electric charge/[150×60] sec
Electric charge = 0.55 × 9000
= 4950 C
(xv) (b) Steel
Preferred material for electromagnet that can be demagnetised easily alloy of aluminium, nickel and
cobalt give a substance called AlNiCo which has easy tempering properties and hence gets easily
|Contact force||Non-contact force|
|1.||The force caused between two bodies due to actual physical contact is called contact force.||The force caused between two bodies separated by a distance is called as non-contact force.|
|2.||It is independent of distance of separation between the bodies.||It is inversely proportional to square of distance between the two bodies.|
|Temporary Magnet||Permanent Magnet|
|1. They are made of soft iron.||They are made from steel.|
|2. They behave like a magnet only as long as there is an inducing magnet.||They act as a magnet even on the removal of the inducing magnet.|
|3. They have very poor magnetic retention.||They have a very high magnetic retention.|
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