1. 0.1 m
2. 10 cm
3. 1 cm
4. 0.01 cm
A block slides down on an incline of angle 30° with an acceleration \(\frac g4.\) Find the kinetic friction coefficient.
1. \(\frac{1}{2\sqrt2}\)
2. \(0.6\)
3. \(\frac{1}{2\sqrt3}\)
4. \(\frac{1}{\sqrt2}\)
Two long straight wires, each carrying an electric current of 5 A, are kept parallel to each other at a separation of 2.5 cm. Find the magnitude of the magnetic force experiment by 10 cm of a wire.
1. 4.0 × 10-4 N
2. 3.5 × 10-6 N
3. 2.0 × 10-5 N
4. 2.0 × 10-9 N
A wire of resistance 10 Q is bent to form a complete circle. Find its resistance between two diametrically opposite points.
1. \(5~\Omega\)
2. \(2.5~\Omega\)
3. \(1.25~\Omega\)
4. \(\frac{10}{3}~\Omega\)
1. 2.1 x 10-3 \(\Omega\)
2. 1.3 x 10-4 \(\Omega\)
3. 3.2 x 10-4 \(\Omega\)
4. 4.6 x 10-2 \(\Omega\)
1. 50 N
2. 26 N
3. 29 N
4. 45.9 N
3. \( 600 \mathrm{~J}\)
4. \( 900 \mathrm{~J} \)
A uniform ring of mass \(m\) and radius a is placed directly above a uniform sphere of mass m and of equal to radius. The centre of the ring is at a distance \(\sqrt3a\) from the centre of the sphere. The gravitational force (F) exerted by the sphere on the ring is:
1. \(\frac{3G~Mm}{8a^2}\)
2. \(\frac{2G~Mm}{3a^2}\)
3. \(\frac{7G~Mm}{\sqrt2a^2}\)
4. \(\frac{3G~Mm}{a^2}\)
A projectile is fired with a velocity \(u\) at angle \(\theta\) with the ground surface. During the motion at any time, it is making an angle \(\alpha\) with the ground surface. The speed of the particle at this time will be:
1. \(u\cos\theta~\sec\alpha\)
2. \(u\cos\theta.\tan\alpha\)
3. \(u^2\cos^2\theta.\sin\alpha\)
4. \(u\sin\theta.\sin\alpha\)