The length of an elastic string is a metre when the longitudinal tension is 4N and b metre when the longitudinal tension is 5N. The length of the string on metre when the longitudinal tension […]
Two poles of same strength attract each other with a force of magnitude F when placed at the two corners of an equilateral triangle. If a north pole of same strength is placed at the […]
Two particles P and Q start from origin and execute simple harmonic motion along X-axis with same amplitude but with periods 3 sec and 6 sec respectively. The ratio of velocities of P and Q […]
An object is projected with a velocity of 20 m/s making an angle of 45⁰ with horizontal. The equation for the trajectory is h=Ax-Bx² where h is the height, x is the horizontal distance, A […]
Two sound waves of wavelengths 5m and 6m formed 30 beats in 3 seconds. The velocity of sound is
Options
(a) 300 m/s (b) 310 m/s (c) 320 m/s (d) 330 m/s
Correct […]
The de-Broglie wavelength of an electron having 80 eV of energy is nearly(Given 1 ev= 1.6 x 10⁻¹⁹ kg, Mass of electron=9 x 10⁻³¹ kg, Planck’s constant= 6.6 x 10⁻³⁴ J-sec)
Options
(a) […]
Thomson coefficient of a conductor is 10 µV/K. Its two ends are kept at 50° C and 60° C. Amount of heat absorbed by the conductor when a charge of 10C flows through it is […]
A body A experiences perfectly elastic collision with a stationary body B. If after collision the bodies fly apart in the opposite directions with equal velocities, the mass ratio fo A and B is
A magnet of length 10 cm and magnetic moment 1 A-m² is placed along the side AB of an equilateral triangle ABC. If length of side AB is 10 cm the magnetic induction at the […]
A lead bullet of 10 gm travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is(sp.heat […]
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