List of practice Questions

Bacterial ribosomes are present
Cork cambium results in the formation of cork which become impermeable to water due to the accumulation of
Which of the following is not a characteristic feature of all the chordates ?
An isosceles prism of angle 120? has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces
A string in a musical instrument is $50\, cm$ long and its fundamental frequency is $800\, Hz$. If a frequency of $1000\, Hz$ is to be produced, then required length of string is
A series resonant $LCR$ circuit has a quality factor ($Q$-factor) 0.4. If $R = 2\, k\Omega, C = 0.1 \, \mu F$, then the value of inductance is
A ray of light is incident at an angle of 60? on one face of a prism of angle 30?. The emergent ray of light makes an angle of 30? with incident ray. The angle made by emergent ray with second face of prism be
A plane mirror produces a magnification of
A galvanometer having a resistance $ 12\, \Omega$ gives a full scale deflection for a current of 2.5 mA. It is converted into a voltmeter of range 10 V, what is the net resistance of the meter?
A circular coil of radius $2R$ is carrying current $I$. The ratio of magnetic fields at the centre of coil and at a point at a distance $6R$ from centre of coil on axis of coil is
The half-life of a ratio-isotope is 4 h. If initial mass of the isotope was 200 g, then mass remaining after 24 h will be
A red flower kept in green light will appear
If $^{}_{92}U^{206}$ emits 8 $\alpha$-particles and 6 $\beta$-particles, then the resulting nucleus is
A uniform wire of resistance R and length L is cut into four equal parts, each of length $L/4$, which are then connected in parallel combination. The effective resistance of the combination will be
A body cools from 50?C to 49?C in 5 seconds. How long will it take to cool from 40?C to 39?C? (Assume temperature of surrounding to be 30?C and Newton?s law of cooling is valid).
Which of the following substances has the highest elasticity?
Two simple harmonic motions a re represented by $y_1=5[\sin\,2\pi t+\,\sqrt{3}\,\cos \,2\pi\,t]$ and $y_2=5\sin[2\pi t +\frac{\pi}{4}]$.The ratio of their amplitude is
Two slabs are of the thicknesses $d_1$ and $d_2$ Their thermal conductivities are $K_1 $ and $K_2$ respectively. They are in series. The free ends of the combination of these two slabs are kept at temperatures $\theta_1 $ and $\theta_2$ . Assume $\theta_1 > \theta_2$ .The temperature $ \theta $ of their common junction is.............
The letter $'D'$ in $D-glucose$ signifies____
In the absence of acrosome, the sperm __________
An electron is moving in an orbit of a hydrogen atom from which there can be a maximum of six transitions. An electron is moving in an orbit of another hydrogen atom from which there can be a maximum of three transitions. The ratio of the velocity of the electron in these two orbits is
A uniform wire of length $L$, diameter $D$ and density $P$ is stretched under a tension $T$. The correct relation between its fundamental frequency $'f'$ , the length $L$ and the diameter $D$ is ............
$P$ is the point of contact of the tangent from the origin to the curve $y = log_ex$ The length of the perpendicular drawn from the origin to the normal at $P$ is ______
When a neutron is disintegrated to give $\beta$-particle, ............
When monochromatic radiation of intensity $I$ falls on a metal surface, the number of photoeleetrons and their maximum kinetic energy are $N$ and $T$ respectively. If the intensity of radiation is $2I$ , the number of emitted electrons and their maximum kinetic energy are respectively