A block of mass M is attached with a spring of spring constant K. The whole system is placed on a vehicle as shown in the figure. If the vehicle starts moving towards right with an acceleration ‘a’ (there is no friction anywhere), then 

Two sound waves of wavelengths 98 cm and 100 cm arrive at the same point, from two different sources. The number of beats heard is (speed of sound is 392 m/s.)

In Y.D.S.E set up the separation between the slits is 10λ. Then the maximum number of interference maxima obtained on the screen is

When two moles of monoatomic gas expands the ratio of the heat supplied that increases the internal energy of the gas and that used in the expansion.

One end of a conducting rod is maintained at temperature 50C and at the other end ice is melting at 0C. The rate of melting of ice is doubled if

At absolute zero temperature; Si acts as a

In an astronomical telescope;  then find out the maximum magnification of a distant object

A body executes simple harmonic motion. The potential energy (PE), kinetic energy (KE) and total energy (TE) are measured as a function of displacement x. Which of the following statements is true?

Mercury is contained in a U-tube of uniform square cross-sectional side a = 4 mm. Electrodes A and D are sealed inside as shown. An electric current I = 10 A passes between the electrodes A to D and magnetic field B = 0.5 tesla is applied across the horizontal arm perpendicular into the plane of figure. Calculate difference of mercury levels. (ρ_Hg = 13.6 × 10³ kg/m³) –