NEET 2013
For the following questions answer them individually
A small object of uniform density rolls up a curved surface with aninitial velocity ‘v’. It reaches up to a maximum height of $$\frac{3 \nu^{2}}{4g}$$ with respect to the initial position .The object is:
A plano convexlensfits exactly into a plan » concave lens. Their plane surfaces are parallel to each other. If lenses are madeofdifferent materials of refractive indices j1, and po and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is:
A parallel beam of fast movingelectrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from theslit. If the speed of the electronsis increased, which of the following statements is correct ?
For a normal eye,the cornea of eye provides converging power of 40 D and the least converging power of eye lens behind the cornea is 20D.using the information , the distance between the retina and cornea-eye lens can be estimated to be:
The upper half of a inclined plane of inclination $$\theta$$ is perfectly smooth while lower half is rough .A blocl starting from the rest top of the plane will gain come to rest at the bottom ,if the coefficients of the friction betwwen the block and lower half of the plane is given by:
A wave travelling in the +ve direction having displacements along y direction as 1m,wavelength $$2 \pi m$$ and frequency of $$\frac{1}{\pi}$$ Hz is reperesented by:
A source of unknown frequency gives 4 $$\frac{beats}{s}$$,when sounded with a source of known frequency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The unknown frequencyis:
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when:
Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r. Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become:
If we study the vibration ofa pipe openatboth ends, then the following statement is not true:
