The velocity of sound in are is not affected by change in the ________.

Eqution of travelling wave on a stretched string of linear density 5 g/m is y = 0.03 sin(450t–9x), where distance and time are measured in SI units. The tension in the string is 

A real gas behaves as an ideal gas at _________.

An ideal gas heat engine operators in a carnot's cycle between 227°C and 127°C. It absorbs 6 x 10⁴J at high temperature. The amount of heat converted into work is ________.

We consider a thermodynamic system. If \(\Delta\)U represent the increase in its energy and W the work done by the system, which of the following statements is true?

An iron tyre is to be fitted on a wooden wheel 0.1 in diameter. The diameter of the tyre is 6 mm smaller than that of the wheel. The tyre should be heated by a temperature of (coefficient of volume expansion of iron is 3.6\(\times\)10^-5/°C) ________

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

What is time period of a pendulum hanged in a satellite? (T is time period on earth)

Water rises in a capillary tube to a certain height such that the upward force due to the surface tension is balanced by 62.84\(\times\)10^-5N force due to the weight of the liquid column. If the surface tension of water is 70\(\times\)10^-3Nm the radius of the capillary tube is ____________.

A body of mass 500g is town upwards with a velocity 20ms^-1 and reaches back to the surface of a planet after 20s. Then the weight of the body on that planet is _____________.

If the masses of the Earth and Sun suddenly double, the gravitational force between them will

The magnitude of a vector cannot be _____________.

Two discs are rotating about their axes, normal to the discs and passing through the centres of the discs. Disc D₁ has D₂ kg mass and 0.2 m radius and initial angular velocity of 50 cad s^-1, Disc D₂, has 4 kg mass, 0.1 m radius and initial angular velocity of 200 rad s^-1 The two discs are brought in contact face to face, with their axes of rotation coincident. The final angular velocity (in rad s^-1) of the system is _______________.

Dimensional formula of self inductance is _______________.

The Van der Waal equation for n moles of a real gas is \((P+\frac{a}{V^2})(V-b)=RT\) where P is the pressure. V is the volume. T is the absolute temperature. R is the molar gas constant and 'a' and 'b' are Van der Waal constants. The dimensions of 'a' are the same as those of _______________.

If a body is raised from the surface of the earth upto height R, what is the change in potential energy?

The condition for skidding is _______________.

Which of the following is the dimension of coefficient of friction?

A body of mass 5 kg is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure.

\(\vec A\) and \(\vec B\) are perpendicular if \(\vec A\)· \(\vec B\) =  ______________

Consider a system of two identical particles. One is at rest and the other has an acceleration \(\overrightarrow { a } \). The centre of mass has an acceleration ______________.

A particle of mass m sliding on the smooth double inclined plane (shown in figure) will experience

Which is deals with the study of materials of an intermediate length scale?

If a particle executes uniform circular motion, choose the correct statement

The density of a material in CGS system of units is 4 g cm^-3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be