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qUESTIONS

MCQs-PYQs-12th-jee

Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

MCQs-PYQs-12th-jee

The dipole moment of a circular loop carrying a current I, is m and the magnetic field at the centre of the loop is B₁. When the dipole moment is double by keeping the current constant, the magnetic field at the centre of loop is B2. The ratio B1/B2 is

MCQs-PYQs-12th-jee

Two short bar magnet of length 1 cm each have magnetic moments 1.20 Am² and 1.00 Am² respectively. They are placed on a horizontal table parallel to each other with their N poles pointing towards the South. They have a common magnetic equator and are separated by a distance of 20.0cm. The value of the resultant horizontal magnetic induction at the mid-point O of the line joining their centres is close to (Horizontal component of earth’s magnetic induction is 3.6 * 10 ^ – 5 * Wb / (m ^ 2)

A source of sound S emitting waves of frequency 100 Hz and an observer O are located at some distance from each other. The source is moving with a speed of 19.4-1 ms at an angle of 60° with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air 330 ms-1) is

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of 15ms-1. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air = 330 ms-1)

In a sinusoidal wave, the time required for a particular point to move from maximum displacement to zero displacement is 0.170 second. The frequency of the wave is

The velocity of sound is u, in air. If the density of air is increased to 4 times, then the new velocity of sound will be

A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 m/sec. The boat bounces up once in every

The function sin² (ωt) represents

The equation of a sound wave is y=0.0015sin (62.4x+316t). The wavelength of this wave is

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