Three identical rods each of mass M , length l are joined to form an equilateral Δ ABC . Find the Moment of Inertia about BC as shown. <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-avs59pyuxw12jq1l.jpg" />

Questions from NTA Abhyas 2022

1. Which one of the following statements is wrong in the context of -rays generated from an -ray tube?

2. Light of two different frequencies whose photons have energies and respectively illuminate a metallic surface whose work function successively. The ratio of maximum speeds of emitted electrons will be

3. A thin semicircular conducting ring of the radius is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ, the speed of the ring is and the potential difference developed across the ring is

4. A flat mirror is arranged parallel to the wall at a distance from it. The light produced by a point source kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity towards the wall.

5. A particle moves along axis as , here is a constant. Which of the following is true?

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2. If and respectively denote energy and gravitational constant, then has the dimensions of:

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3. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

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4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

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5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is , mass of the string is negligible and no other friction exists

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