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Physics Mcqs :: All Aptitude Test ::

Home » General Knowledge » Physics Mcqs » Aptitude Test - 10
1.If in a wire of Young’s modulus Y, longitudinal strain is produced, then the value of potential energy stored in its unit volume will be?
A. YX2
B. YX2
C. 2YX2
D. YX2
2.A stretched rubber has?
A. Increased kinetic energy
B. Increased potential energy
C. Decreased kinetic energy
D. Increased kinetic energy
3.The breaking stress of a wire depends upon?
A. Length of the wire
B. Radius of the wire
C. Material of the wire
D. Length of the wire
4.Which of the following affects the elasticity of a substance?
A. Hammering and annealing
B. Change in temperature
C. Impurity in substance
D. Hammering and annealing
5.The diameter of brass rod is 4mm. Young’s modulus of brass is 9×109 N/m2. The force required to stretch 0.1% of its length is?
A. 360πN
B. 36N
C. 36π×105 N
D. 360πN
6.If the stress is S and the Young’s modulus is Y of material of a wire, the energy stored in the wire per unit volume is?
A. 2Y/S
B. S/2Y
C. 2S2 Y
D. 2Y/S
7.An example of a perfectly plastic body is?
A. Quartz
B. Crystal
C. Putty
D. Quartz
8.A given quantity if an ideal gas is at pressure P and absolute temperature T. What is the isothermal bulk modulus of the gas?
A. 2P/3
B. P
C. 3P/2
D. 2P/3
9.A wire fixed at the upper end stretches by length l by applying a force F. What is the work done in stretching?
A. F/2l
B. Fl
C. 2Fl
D. F/2l
10.The term liquid crystal refers to a state that is intermediate between?
A. Crystalline solid and amorphous liquid
B. Crystalline solid and vapour
C. Amorphous liquid and its vapour
D. Crystalline solid and amorphous liquid
11.Which of the following have well defined geometrical external shapes?
A. Amorphous solids
B. Liquids
C. Gases
D. Amorphous solids
12.A body of weight mg is hanging on a string that extends in length by l. The work done in extending the string is?
A. mgl
B. mgl/2
C. mgl/2
D. mgl
13. At what speed will the velocity head of stream of water be 40 cm?
A. 2.80cms-1
B. 280 cms-1
C. 28 cms-1
D. 2.80cms-1
14.If there were no gravity, which of the following will not be there for a fluid?
A. Viscosity
B. Surface tension
C. Pressure
D. Viscosity
15.Motion of a liquid in a tube is best described by?
A. Bernoulli theorem
B. Poiseuille’s equation
C. Stoke’s law
D. Bernoulli theorem
16.Critical velocity of the liquid?
A. Decrease when radius decreases
B. Increases when radius increases
C. Decreased when density increases
D. Decrease when radius decreases
17.A steel ball is dropped in oil, then?
A. The ball attains constant velocity after sometime
B. The ball stops
C. The speed of ball will keep on increasing
D. The ball attains constant velocity after sometime
18.An aeroplane gets its upward lift due to a phenomenon described by the?
A. Archimedes’ principle
B. Bernoulli’s principle
C. Buoyancy principle
D. Archimedes’ principle
19.The rate of flow of liquid through an orifice of a tank does not depend upon?
A. The size of the orifice
B. Density of liquid
C. The height of fluid column
D. The size of the orifice
20.The velocity of efflux of a liquid through an orifice in the bottom of the tank does not depend upon?
A. Size of orifice
B. Height of liquid
C. Acceleration due to gravity
D. Size of orifice
21.A body of mass 15kg is dropped into the water. If the apparent weight of the body is 107N, then the applied thrust will be?
A. 40 N
B. 80 N
C. 60 N
D. 40 N
22.The mass of the moon is 1% of the mass of the earth. The ratio of gravitational pull on moon and that of moon in earth will be ?
A. 1:1
B. 1:10
C. 1:100
D. 1:1
23.If the earth loses its gravity, then for a body ?
A. Weight becomes zero
B. Mass becomes zero
C. Neither mass nor weight is zero
D. Weight becomes zero
24.A ball is dropped from a spacecraft revolving around the earth at a height of 120km. What will happen to the ball?
A. It will go very far in the space
B. It will move with the same speed tangentially to the spacecraft
C. It will fall down to the earth gradually
D. It will go very far in the space
25.The velocity with which a projectile must be fired so that it escapes the earth’s gravitational field doesn’t depend on?
A. Mass of the earth
B. Mass of the projectile
C. Radius of the orbit
D. Mass of the earth
26.The escape velocity of a projectile from the earth is approximately?
A. 7km/sec
B. 11.2km.sec
C. 112km/sec
D. 7km/sec
27.What is Black hole?
A. Super surface of the atmosphere
B. Ozone layer
C. Super dense planetary material
D. Super surface of the atmosphere
28.If the orbital radius of the earth is made 4 times, then find the duration of the year if earlier it was T?
A. T
B. 2T
C. 4T
D. T
29.If radius of the earth is reduced, then?
A. Time duration is reduced
B. Earth rotates slower
C. Time period of earth decreases
D. Time duration is reduced
30.A point mass m is placed inside a spherical shell of radius R and mass M at a distance R/2 from the centre of the shell. The gravitational force exerted by the shell on the point mass is?
A. GMm/R2
B. GMm/R
C. Zero
D. GMm/R2
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