TNPSC Physics - Mechanics
Exam Duration: 45 Mins Total Questions : 30
Which of the following pair is wrong?
- (a)
Pressure - Barometter
- (b)
Relative density - Pyrometer
- (c)
Temperature - Thermometer
- (d)
Earthquacke - Seismograp
Which of the followingoair of physical Quantities has the the same dismensions?
- (a)
Work and Power
- (b)
Momentom and Energy
- (c)
Forc and Power
- (d)
Work and Energy
A noise level of 100 deciabel wouls correspond to
- (a)
Just audible Sound
- (b)
Ordinary conversation
- (c)
Sound from a noisy street
- (d)
Noise from a machine shop
Consider the following statements
1. All plane angles are measured in radian.
2. All the soild angles are measured in steradian.
3.Solid angle is measured in streadian.
- (a)
Only 1
- (b)
Only 3
- (c)
2 and 3
- (d)
1, 2 and 3
Which of the following statement is false?
- (a)
A body can have zero velocity and still be accelerated
- (b)
A body can have a constant velocity and still have a varying speed
- (c)
A body can have a constant speed and still have varying velocity
- (d)
The direction of the velocity of a body can charge when its acceleration is constant
A ball P is droped vertically and another ball Q is thrown horizontally with the same velocities from the same height and at the same time. If air resistance is neglected, then
- (a)
Ball P is reached the ground firstt
- (b)
Ball Q is reaches the ground first
- (c)
Both reaches the ground ath the same time
- (d)
The repective masses of the two balles will decide the time
A ball is thrown upward ant it returns to ground describing a parabolic path. Which of the following remainds Constant?
- (a)
Kinetic energy of the ball
- (b)
Speed of the ball
- (c)
Horizontal component of velocity
- (d)
Vertical component of velocity
An athlete diving off high spring board can perform a variety of exercise in the air before entering the water body. Which one of the following parameter will remain constant during the fall?
- (a)
The athlete's linear momentum
- (b)
The athlete's angular momentum
- (c)
The athlete's kinetic energy
- (d)
The athlete's moment of inertia
A person is sitting in a car which is at rest. The reaction from the road at each of the four wheels of the car is R. When the car runs on a straight level road, how will the reaction at either of the front wheels vary?
- (a)
It will be greater than R
- (b)
It will be less than R
- (c)
It will be equal to R
- (d)
It shall depend on the materials of the road
An object is undergoing a non-accelerated motion. Its rate of change in momentum is
- (a)
a non-zero constant
- (b)
zero
- (c)
not a constant
- (d)
None of the above
A piece of paper and cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously?
- (a)
They must have the same volume
- (b)
They must have same density
- (c)
They must have the same mass
- (d)
The must be dropped in Vaccum
A car is running on a road at a uniform speed of 60 km/h. The net resultant force on the car is
- (a)
driving force in the direction of car's motion
- (b)
resistance force opposite to the direction of car's motion
- (c)
an inclined force
- (d)
equal to zero
a ball is dropped from height 5 m. Ball is embedded in sand 1 m and stops, then
- (a)
Only momentum remains conserved
- (b)
Only kinetic energy remains conserved
- (c)
both momentum and KE are conserved
- (d)
either KE nor momentum is conserved
The kinetic energy of a particle continuously increases with time
- (a)
the resultant force on the particle must be parallel to the velocity at all instants
- (b)
the resultant force on the particle must be at an angle greater than 90\(^{o}\) all the time.
- (c)
the magnitude of its linear momentum is increasing continuously
- (d)
its height above the ground level must continuously decrease
A metal ball and a rubber ball of the same mass are dropped from the same height. After hitting the floor, the rubber ball rises higher than the metal ball, why?
- (a)
Momentum is not conserved when the metallic ball hits the floor
- (b)
the rubber ball hits the floor with greater velocity
- (c)
Momentum is not conserved when rubber ball hits the floor
- (d)
None of the above
A bullet hits and gets embedded in a solid block resting on a horizontal frictionless table. What is conserved?
- (a)
Momentum
- (b)
Momentum and KE
- (c)
KE
- (d)
Neither momentum nor KE
Match the following lists
List I (Equipments/instruments) |
List II (Transformation of Energy) |
A. Dynamo | 1. Sound energy of electrical energy |
B. Microphone | 2. Mechanical energy into electrical energy |
C. Loudspeaker | 3. Mechanical energy into sound energy |
D. Musical instrument | 4. Electrical energy into sound energy |
- (a)
A B C D 1 2 3 4 - (b)
A B C D 2 1 4 3 - (c)
A B C D 4 3 2 1 - (d)
A B C D 3 4 2 1
When the velocity of the body is doubled
- (a)
its KE is doubled
- (b)
its PE is doubled
- (c)
its momentum is doubled
- (d)
its acceleration is doubled
Consider the following statements
1. Friction is a non-conservative force which always opposes the motion of a body over the other.
2. the usual methods of reducing friction are polishing of surfaces, lubrication with oil or grease, use of ball bearing etc.
3. Friction due to air is considerably reduced by streamlining the shape of the body.
4. Friction depends upon the nature of the material of surfaces in contact.
Which of the statement(s) is/are correct?
- (a)
1 and 2
- (b)
2 and 3
- (c)
1, 2, 3 and 4
- (d)
Only 4
Consider the following pairs of substances/situation
1. Piece of Teflon on another piece of Teflon.
2. A block of ice on another block of ice.
. Rubber tyre on a wet road.
4. Rubber tyre on a dry road.
The correct sequence of the decreasing order of their magnitude of the coefficient of friction is
- (a)
4, 3, 2, 1
- (b)
4,3, 1, 2
- (c)
3, 4, 2, 1
- (d)
3, 4, 1, 2
Match the following columns
mn I | Column II |
A. Static friction | 1. is slightly less than limiting friction |
B. Dynamic friction | 2. is maximum value of static friction |
C. Limiting friction | 3. is equal to tangent of angle of repose |
D. Coefficient of friction | 4. is self-adjusting |
- (a)
A B C D 2 3 4 1 - (b)
A B C D 4 1 2 3 - (c)
A B C D 3 2 1 4 - (d)
A B C D 4 1 3 2
The weight of the body at the centre of the earth is
- (a)
infinite
- (b)
zero
- (c)
slightly less than at the equator
- (d)
slightly more than that at the equator
Weightlessness experienced in spaceship is due to
- (a)
absence of inertia
- (b)
absence of accelerating force
- (c)
absence of gravity
- (d)
free fall of the spaceship
As we go from the equator to the poles, the value of g
- (a)
remains the same
- (b)
increases
- (c)
decreases
- (d)
None of these
the time period of an artificial satellite in a circular orbit is independent of
- (a)
radius of the orbit
- (b)
the mass of the satellite
- (c)
mass of the earth and radius of the earth
- (d)
None of the above
Match the following lists
List I | List II |
A. Every planet revolves around the sun in elliptical orbit and the sun is situated at one foci of ellipse | 1. Copernicus |
B. The position vector of the particle with respect to the centre of force has a constant areal velocity | 2. Ptolemy |
C. Geocentric theory of planetary motion | 3. Inverse square law |
D. Heliocentric theory of planetary motion | 4. Law of conservation of angular momentum |
- (a)
A B C D 3 4 2 1 - (b)
A B C D 1 2 3 4 - (c)
A B C D 4 3 2 1 - (d)
A B C D 2 1 3 4
A girl is swinging on a swing in the sitting position. How will the period of swing be affected if she stands up?
- (a)
The period will now be shorter
- (b)
The period will now be longer
- (c)
The period will remain unchanged
- (d)
None of the above
The restoring force in SHM is maximum, when the particle is
- (a)
half way between mean position and the extreme position
- (b)
rest initially
- (c)
at rest instantaneosly
- (d)
at mean position
A simple pendulum is oscillating in a lift. If the lift starts moving upwards with a uniform acceleration, the period will
- (a)
be longer
- (b)
remain unaffected
- (c)
be shorter
- (d)
None of the above
Consider the following statements
1. in summer seasi=on, the effective length of the pendulum clock is lengthened (increased length), so its time period is also increased and consequently the clock becomes slow.
2. In winter season, the effective length is contracted thus time period is decreased and the clock becomes fast.Which of the statement(s) given above is/are correct?
- (a)
Only 1
- (b)
Only 2
- (c)
Both 1 and 2
- (d)
Neither 1 nor 2