VIVA questions
VIVA VOICE
VIVA Questions from Krishnam Raj sir.
Simple Pendulum
- What is a simple Pendulum? Answer
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Answer: an ideal simple pendulum consists of a heavy point mass(bob) tied to one end of a perfectly inextensible,flexible and weightless string.
- What is a seconds Pendulum? Answer
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Answer: a seconds pendulam is a pendulam which takes two seconds for one oscillation.
- What is the nature of oscillations of simple pendulum? Answer
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Answer: one complete to and fro movement of a pendulam about it's mean position is known as an oscillation or vibration.
- What is the length of the simple pendulum? Answer
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Answer: the distance between point of suspension of the pendulam and its center of gravity(bob) is called as length of simple pendulam.
- What is the shape of the l-T graph of simple pendulum? Answer
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Answer: shape of l-T graph is a parabola.
- What is the shape of the l- T^2 graph of a simple pemdulum ? Answer
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Answer: shape of l-T^2 graph is straight line.
- Does a simple pendulum stop finally? Why? Answer
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Answer: Yes, because of the air resistance on the pendulum and the frictional force between the string and the pivoted point.
- what is time period of simple pendulum Answer
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Answer: time taken by bob of the simple pendulam to make one complete vibration, is called as the time period of simple pendulam.
- what is the relation between the period of simple pendulum and acceleration due to gravity? Answer
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Answer: the period of a simple pendulam is inversely propotional to the square root of acceleration due to gravity.
- The relationship between the period of a simple pendulum and the length of pendulum Answer
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Answer: the period of a simple pendulam is directly propotional to the square root of length of pendulam.
- What is an oscillation? Answer
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Answer: one complete to and fro movement of a pendulam about it's mean position is known as an oscillation or vibration.
- what is the frequency of simple pendulum? Answer
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Answer: the no.of oscillations made by the pendulam in one second is called it's frequency(Hz)
- Is the period of a simple pendulum is dependent of the amplitude of oscillation? Answer
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Answer: No, the period of a simple pendulam is independent of the amplitude of oscillation
Surface Tension
- Define surface tension? Answer
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Answer: surface tension a phenomenon at the surface of a liquid caused by intermolecular forces.
- If the diameter of the capillary tube is doubled what will happen to rise of liquid ? Answer
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Answer: if the diameter of capillary tube is doubled the liquid level increase.
- What are cohessive and adhessive forces ? Give examples Answer
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Answer: the attractions between water molecules are called as cohesive forces.the attraction between water molecules and the walls of vessel is called as adhesive forces.
- what is the direction of the surface tension? Answer
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Answer: surface tension is also directed towards the force acting on the object.
Sound Velocity
- Define resonance ? Answer
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Answer: vibration of large amplitude produced by a relatively small vibration near the same frequency of vibration as the natural frequency of the resonating system is called as "resonance"
- Out of solids , liquids, and gasses through which medium sound propagate more ? Answer
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Answer: out of solids,liquids,gases through solid medium sound propagate more.
- Either the sound waves are longitudinal or transverse? Answer
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Answer: sound waves are tranaverse waves.
- Waht are transverse waves ? Answer
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Answer: the waves which are passing in right angle direction.
- What are longitudinal waves? Answer
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Answer: the waves which are passing in length wise.
Sonemeter
- state the laws of strings. Answer
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Answer:
- law of length v inversely propotional to length.
- law of tension v directly propotional root of T.
- law of mass v inversely propotional to 1/root of m
Helical Spring
- what are the units of force constant? Answer
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Answer: units of force constant sre dyne/cm or N/m
- Either spring force is conservative or not ? Answer
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Answer: spring force is concervative.
- What is simple homonic motion ? Answer
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Answer: periodic motion in which the restoring force is proportional to the displacement is calld simple harmonic motion.
- What is periodic motion ? Answer
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Answer: periodic motion that recurs over and over and the period of time required for each recurrence remains the same.
- What is oscilatory motion ? Answer
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Answer: oscillatory motion having periodic vibrations
- All periodic motions are hormonic .is this statement true .why?explain with example Answer
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Answer: L.C of screwgauge is 0.01mm or 0.001cm,vernier callipers is 0.1mm or 0.01cm.spherometre is 0.01mm or 0.001cm
- find out least count of screw guage vernier and spherometer? Answer
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Answer: pitch of screwgauge is 0.5 mm,spherometre is 1mm
- pitch= distance travelled by screw/No. of full rotations given.
- L.C=pitch/NO. of head scale divisions
- length of object=M.S.D+(V.S.D*L.C)
- radius of curvature=d^2/6h+h/2
- surface tension=r(h+r/3)g/2
- height of curvature=n*pitch+(I.C.S.R-F.C.S.R)*L.C ,I.C.S.R>F.C.S.R
- height of curvature=n*pitch+({100*I.C.S.R}-F.C.S.R)*L.C ,I.C.S.R,F.C.S.R
Boyl's Law
- state boyle's law ?
- What is the shape of the (h-l)/l graph ?
- How can you find the atmospheric pressure from h-l)/l graph?
- What is the shape of the P-l graph?
- At what conditions the Boyle's law is true ?
- In the verification of Boyle's law it is proved that P*l = constant instead of P*V = constant . Why ?
- The air coloumn should not be touched with the hand during the experiment . Why?
- For every change of reservior wait for some time and note the reading . Why?
