The figure here shows a smooth ‘looping-the-loop’ track. A particle, of mass m, is released from point A, as shown in the figure. If H = 3r,... View Article
The standard reduction electrode potential of four elements A, B, C and D are 0.8 V, 0.2 V, –1.8 V and –0.5 V respectively, the element with the... View Article
A batsman hits back a ball straight in the direction of the bowler without changing its initial speed of 12 ms⁻¹. If the mass of the ball is 0.15... View Article
A cyclotron’s oscillating frequency is 10 MHz. The radius of dee is 60 cm. What is the kinetic energy of proton produced by the accelerator, if... View Article
Two point charges 8q and -2q are located at x = 0 and x = L respectively. The point on the x-axis at which the net electric field is zero due to... View Article
Earth’s magnetic field at the magnetic equator is approximately 0.4 g. Earth’s dipole moment is (re = 6.4 × 106 m) (a) 4 × 10-5 Am2 (b) 4 × 102... View Article
Two tuning forks having frequencies 450 Hz and 448 Hz are tuned together. The time interval between successive instants of maximum intensity will... View Article
Two resistors of resistance r and 3r have thermal coefficients of resistance α and 2α respectively. The equivalent thermal coefficient of... View Article
A particle is subjected to two simple harmonic motions (both along the x-axis) which are given by . The path of the particle will be (a) a... View Article
Even when rain is falling vertically downwards the front screen of a moving car gets wet. On the other hand, the back screen remains dry. Why?... View Article
An electric heater having a heating coil of 150 ohms connected with a supply voltage of 220 V is used to heat water. The time taken to increase... View Article
A laser beam of a plane monochromatic radiation has an intensity of 2.5 × 10^14 Wm−2. The amplitude of the magnetic field in this beam is... View Article
If the equation of sound wave is y = 0.0015sin(62.4x + 316t), then its wavelength will be Answer: If the equation of the sound wave is y =... View Article
The half-life of undergoing α-decay is 4.5 * 10-9. What is the true activity initial 1 gm of the sample? Answer: The true activity of the... View Article
A car is moving on a circular track of radius of 150 m, and at some time, its speed is decreasing at a rate of 8 ms2. If the speed of the car at... View Article
A balloon of weight w newton descends with an acceleration f m/s2. The weight that must be thrown out in order to give equal upward acceleration... View Article
A charge q is moving with a velocity opposite to the direction of magnetic field force on the charge due to the magnetic field is (a) 0 (b) qB/v... View Article
Two stones having different masses m1 and m2 are projected at angles θ and (90 - θ) with the same speed from the same point. The ratio of their... View Article
The blades of an aeroplane are rotating at the rate of 600 revolutions per minute the angular velocity of blades is (a) π rad/s (b) 2π rad/s (c)... View Article
Two inductors of inductance l each are connected in series with the opposite magnetic fluxes, the resultant inductance is (a) 0 (b) L (c) 2L (d)... View Article
