The displacement x of a particle varies with time t as where a, b, and are positive constants. The velocity of the particle will
 

 

Subtopic:  Instantaneous Speed & Instantaneous Velocity |
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A transformer having efficiency of 75% is working on 220V and 4.4kW power supply. If the current in the secondary coil is 5A. What will be the voltage across secondary coil and the current in primary coil?
 

 

Subtopic:  Transformer |
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A fish rising vertically to the surface of water in a lake uniformly at the rate of 2m/s observes a kingfisher diving vertically towards the water at a rate of 10M/s. If refractive index of water what will be the actual velocity of the kingfisher
 

1.  10 m/s
2.  8 m/s
3.  6 m/s
4.  9 m/s

Subtopic:  Refraction at Plane Surface |
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One mole of a monoatomic ideal gas undergoes the process in the given P-V diagram. The molar heat capacity for this process is:
 

 

Subtopic:  Molar Specific Heat |
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A pan with a set of weights is attached to a light spring. The period of vertical oscillation is 0.5s. When some additional weights are put in pan, then the period of oscillations increases by 0.1s. The extension caused by the additional weight is
 
1.  5.5 cm
2.  3.8 cm
3.  2.7 cm
4.  1.3 cm

 

Subtopic:  Simple Harmonic Motion |
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A cylinder of radius R and length L is placed in a uniform electric field E parallel to the cylinder axis. The total flux for the surface of the cylinder is given by

 

Subtopic:  Gauss's Law |
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If A + B = C and that C is perpendicular to A. What is the angle between A and B, if 

 

Subtopic:  Scalar Product |
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A beam of light travelling along X-axis is described by the electric field Ey = 600 V/m. sin ωt-xc, the maximum magnetic force on a charge q = 2e, moving along Y -axis with the speed of 3 x 108 m/s is
1.  19.2 x 10-17N
2.  1.92 x 10-17N
3.  0.192 N
4.  None of these
Subtopic:  Properties of EM Waves |
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A body is whirled in a horizontal circle of radius 25 cm. It has an angular velocity of 13 rad/s. What is its linear velocity at any point on circular path?
 
1.  2 m/s
2.  3 m/s
3.  3.25 m/s
4.  4.25 m/s

 

Subtopic:  Circular Motion |
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In the given figure, potential difference between A and B is 
 

 

Subtopic:  PN junction |
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