Science Physics MCQ-160

General Science-Physics Online Practice Exam UPPSC, NDA, CivilsPrelims, SSC, UPSC, CDS, DelhiPolice, RBI Exams

The surface tension phenomenon is the result of the tendency of a system to


A liquid will not wet the surface of solid if the angle of contact is


Meniscus of mercury in a capillary is


An oil drop is placed on the surface of water. It will


When the temperature increases, the angle of contact of liquid


When there are no external forces the shape of a liquid drop is determined by


Ball pen functions on which one of the following principle?


Consider the following statements’”*” If there were no capillarity
1. |t would be impossible to use a kerosene lamp.
2. One would not be able to use a straw to consume a soft drink.
3. The blotting paper would fail to function.
4. There would have been no plants on the earth.
Which of the statements given above are correct?


Consider the following statements
1. Surface tension of liquid depends on length but not on the area, like the elastic property.
2. SI unit of surface tension is N/m.
3. Surface tension is a scalar quantity because it has no specific direction for a given liquid.
Which of the statement(s) given above is/are correct?


Viscosity is the property of liquids by virtue of which they


Bernoulli’s theorem is based on the conservation of


The velocity of rain drop attains constant value because of


If temperature rises, the coefficient of viscosity of liquid


Bernoulli’s theorem is applicable to


When the terminal velocity is reached, the acceleration of a body moving through a viscous medium is


An application of Bernoulli’s equation for fluid flows is found in


The terminal velocity of a small sized spherical body of radius r falling in a viscous liquid is proportional to


A small and & large min drops are falling through air


A small drop fails from rest from a large height h in air the final velocity is


Three identical vessels A, B and C are filled with water, mercury and kerosene respectively up to a equal height. The three vessels are provided with identical taps at the bottom of the vessels. If the three taps are opened simultaneously, then which vessel is emptied first?


Dynamic lift is related to


The velocity of flow of liquid through an orifice at the bottom of a tank depends on the


Consider the following statements
1. The viscosity of a gas increases with rise in temperature.
2. The viscosity of the liquid falls very rapidly with rise in temperature.
Which of the statements (s) given above is/are correct?


Consider the following statements
1. The coefficient of viscosity is the only parameter through which the viscosity of the fluid is measured.
2. Negative sign of coefficient of viscosity indicates that the viscous force opposes the relative motion.
3. The SI unit of viscosity is Nsm -2
4. 1 poise = 1 N


A large tank having a small hole at the bottom is filled with water to a height h.If the stream of water coming out of the hole is directed vertically upwards it will