A condenser of 250 is connected in parallel to a coil of inductance of 0.16 mH, while its effective resistance is 20 Ω. Determine the resonant frequency.

1. $9\times {10}^{4}Hz$

2. $16\times {10}^{7}Hz$

3. $8\times {10}^{5}Hz$

4. $9\times {10}^{3}Hz$

For Bragg’s diffraction by a crystal to occur, then the X-ray of wavelength and interatomic distance d must be

1. $\lambda$ is greater than 2d

2. $\lambda$ equals 2d

3. $\lambda$ is smaller than or equal to 2d

4. $\lambda$ is smaller than 2d

A wire having mass m and length l can freely slide on a pair of parallel smooth horizontal rails placed in vertical magnetic field B. The rails are connected by a capacitor of capacitance C. The electric resistance of the rails and the wire as shown in the figure. Then, the acceleration of the wire can be given as 

1. $a=\frac{C^2{B}^2 l-F}{m}$

2. $a=\frac{F}{m+CBl}$

3. $a=\frac{F{C}^2{B}^2 l}{m}$

4. $a=\frac{F}{m+C^2{B}^{2}l}$

Consider the situation shown in figure A spring of spring constant 400 N/m is attached at one end to a wedge fixed rigidly with the horizontal part. A 40 g mass is released form rest while situated at a height 5 cm the curved track. The minimum deformation in the spring is nearly equal to  

1. 9.8 m

2. 9.8 cm

3. 0.98 m

4. 0.009 km

A block having mass m collides with an another stationary block having mass 2 m. The lighter block comes to rest after collision. If the velocity of first block is v, then the value of coefficient of restitution will must be

1. 0.5

2. 0.4

3. 0.6

4. 0.8

A uniform sphere of mass 500 g rolls without slipping on a plane surface so that its centre moves at a speed of 0.02 m/s. 
The total kinetic energy of rolling sphere would be (in J)

1. $1.4\times {10}^{-4} J$

2. $0.75\times {10}^{-3} J$

3. $5.75\times {10}^{-3} J$

4. $4.9\times {10}^{-5} J$

The force on a particle as the function of displacement x(in x-direction) is given by 
F = 10 + 0.5 x 
The work done corresponding to displacement of particle from x = 0 to x = 2 unit is

1. 25 J

2. 29 J

3. 21 J

4. 18 J

The reading of a spring balance corresponds to 100 N while situated at the north pole and a body is kept on it. The weight record on the same scale if it is shifted to the equator, is 

1. 99.66 N

2. 110 N

3. 97.66 N

4. 106 N

If the intensity is increased by a factor of 20; then how many decibels in the sound level increased?

1. 18

2. 13

3. 9

4. 7