Recent questions in JEEMAIN and NEET

A child swinging on a swing in sitting position, stands up, then the time period of the swing will :

asked Dec 11, 2018 by pady_1

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A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is :

asked Dec 11, 2018 by pady_1

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A cylinder of height 20 m is completely filled with water. The velocity of efflux of water (in $ms^{-1}$ ) through a small hole on the side wall of the cylinder near its bottom, is :

asked Dec 11, 2018 by pady_1

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The minimum velocity (in $ms^{-1})$ with which a car driver must traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding is :

asked Dec 11, 2018 by pady_1

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Initial angular velocity of a circular disc of mass $M$ is $\omega_1$ . Then two small spheres of mass $m$ are attached gently to two diametrically opposite point on the edge of the disc. What is the final angular velocity of the disc ?

asked Dec 11, 2018 by pady_1

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In a simple harmonic oscillator, at the mean position :

asked Dec 11, 2018 by pady_1

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The part of a transistor which is most heavily doped to produce large number of majority carries is :

asked Dec 11, 2018 by pady_1

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The energy band gap is maximum in :

asked Dec 11, 2018 by pady_1

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If mass-energy equivalence is taken into account, when water is cooled to form ice, the mass of water should :

asked Dec 11, 2018 by pady_1

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When temperature increases, the frequency of a tuning fork :

asked Dec 11, 2018 by pady_1

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Cooking gas containers are kept in a lorry moving with uniform speed. The temperature of the gas molecules inside will :

asked Dec 11, 2018 by pady_1

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The kinetic energy needed to project a body of mass $m$ from the earth's surface (radius R) to infinity is :

asked Dec 11, 2018 by pady_1

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An astronomical telescope has a large aperture to `:

asked Dec 11, 2018 by pady_1

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The power factor of an AC circuit having resistance $R$ and inductance $L$ (connected in series) and an angular velocity $\omega$ is :

asked Dec 11, 2018 by pady_1

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Length of a string tied to two rigid supports is $40 \; cm$ . Maximum length (wavelength in cm) of a stationary wave produced on it, is :

asked Dec 11, 2018 by pady_1

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Which statement is incorrect ?

asked Dec 11, 2018 by pady_1

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Which of the following is more close to a black body ?

asked Dec 11, 2018 by pady_1

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If there are $n$ capacitors in parallel connected to $V$ volt source, then the energy stored is equal to :

asked Dec 11, 2018 by pady_1

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By increasing the temperature, the specific resistance of a conductor and a semiconductor :

asked Dec 11, 2018 by pady_1

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If $N_0$ is the original mass of the substance of half-life period $t_{1/2} = 5\; years$ , then the amount of substance left after 15 years is

asked Dec 11, 2018 by pady_1

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Infrared radiations are detected by :

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If $\theta_i$ is the inversion temperature, $\theta_n$ is the neutral temperature, $\theta_c$ is the temperature of the cold junction then :

asked Dec 11, 2018 by pady_1

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Identify the pair whose dimension are equal :

asked Dec 11, 2018 by pady_1

1 answer

Which of the following are not electromagnetic waves ?

asked Dec 11, 2018 by pady_1

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The escape velocity of a body depends upon mass as :

asked Dec 11, 2018 by pady_1

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Which of the following is used in optical fibres ?

asked Dec 11, 2018 by pady_1

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Electromagnetic waves are transverse in nature is evident by :

asked Dec 11, 2018 by pady_1

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At absolute zero, Si acts as :

asked Dec 11, 2018 by pady_1

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Heat given to a body which raises its temperature by $1^{\circ}C$ is :

asked Dec 11, 2018 by pady_1

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If a current is passed through a spring then the spring will :

asked Dec 11, 2018 by pady_1

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Two identical particle move towards each other with velocity $2v$ and $v$ respectively. The velocity of centre of mass is :

asked Dec 11, 2018 by pady_1

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Wavelength of light used in optical instrument are $\lambda_1 = 4000 \mathring{A}$ and $\lambda_2 = 5000 \mathring{A}$ , then ratio of their respective resolving powers (corresponding to $\lambda_1$ and $\lambda_2$ ) is :

asked Dec 11, 2018 by pady_1

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If in the circuit, power dissipation is 150 W, then $R$ is : <br>

asked Dec 11, 2018 by pady_1

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A charged particle $q$ is placed at the centre $O$ of cube of length $L \;(ABCDEFGH)$ . Another same charge $q$ is placed at a distance $L$ from $O$ . Then the electric flux through $ABCD$ is : <br>

asked Dec 11, 2018 by pady_1

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If a spring has time period T, and is cut into $n$ equal parts, then the time period of each part will be :

asked Dec 11, 2018 by pady_1

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Energy required to move a body of mass $m$ from an orbit of radius $2R$ and $3R$ is :

asked Dec 11, 2018 by pady_1

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If an electron and proton having same momenta enter perpendicularly to a magnetic field, then :

asked Dec 11, 2018 by pady_1

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On moving a charge of 20 C by 2 cm, 2J of work is done, then the potential difference between the points is :

asked Dec 11, 2018 by pady_1

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A wave $y =a \sin (wt-kx)$ on a string meets with another wave producing a node at $x=0$ . Then the equation of the unknown wave is :

asked Dec 11, 2018 by pady_1

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A tuning fork arrangement (pair) produces 4 beats/s with one fork of frequency 288 cps. A little wax is placed on the unknown fork and it then produces 2 beats/s. The frequency of the unknown fork is :

asked Dec 11, 2018 by pady_1

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Tube A has both ends open while tube B has one end closed, otherwise they are identical. The raio of fundamental frequency of tubes A and B is :

asked Dec 11, 2018 by pady_1

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If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electrons from $n=2$ is :

asked Dec 11, 2018 by pady_1

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A wire when connected to 220 V mains supply has power dissipation $P_1$ . Now the wire is cut into two equal piece which are connected in parallel to the same supply. Power dissipation in this case is $P_2$ . Then $P_2 : P_1$ is :

asked Dec 11, 2018 by pady_1

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If two mirrors are kept at $60^{\circ}$ to each other, then the number of images formed by them is :

asked Dec 11, 2018 by pady_1

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If in a circular coil $A$ of radius $R$ , current $i$ is flowing and in another coil $B$ of radius $2R$ a current $2i$ is flowing, then the ratio of the magnetic fields, $B_A$ and $B_B$ produced by them will be :

asked Dec 11, 2018 by pady_1

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If an ammeter is to be used in place of a voltmeter, then we must connect with the ammeter a :

asked Dec 11, 2018 by pady_1

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If suddenly the gravitational force of attraction between earth and a satellite revolving around it becomes zero, then the satellite will :

asked Dec 11, 2018 by pady_1

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If a body loses hald of its velocity on penetrating 3 cm in a wooden block, then how much will it penetrate more before coming to rest ?

asked Dec 11, 2018 by pady_1

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From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically). If $\nu_A$ and $\nu_B$ are their respective velocities on reaching the ground, then :

asked Dec 11, 2018 by pady_1

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A ball whose kinetic energy is E, is projected at an angle of $45^{\circ}$ to the horizontal. The kinetic energy of the ball at the highest point of its flight will be:

asked Dec 11, 2018 by pady_1

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