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Recent questions and answers in 2000

Questions >> JEEMAIN and NEET >> NEET PAST PAPERS >> 2000

A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be :

answered Oct 30, 2019 by nagarkotigarima081

2 answers

When an electron do transition from n = 4 to n = 2, then emitted line in spectrum will be :

answered Oct 30, 2019 by meena.clay6

1 answer

The cations and anions are arranged in alternate form in :

answered Oct 30, 2019 by meena.clay6

1 answer

The life span of atomic hydrogen is :

answered Oct 30, 2019 by meena.clay6

2 answers

The correct relation for $\alpha$ , $\beta$ for a transistor :

answered Oct 30, 2019 by meena.clay6

1 answer

For a planet having mass equal to mass of the earth but radius is one fourth of radius of the earth. Then escape velocity for this planet will be

answered Oct 30, 2019 by meena.clay6

1 answer

The potentiometer is best for measuring voltage, as :

answered Oct 30, 2019 by meena.clay6

2 answers

Which pair have not equal dimensions :

answered Oct 29, 2019 by meena.clay6

1 answer

A bubble in glass slab $(\mu = 1.5)$ when viewed from one side appears at 5 cm and 2 cm from other side, then thickness of slab is :

answered Oct 29, 2019 by meena.clay6

1 answer

According to the Faraday Law of electrolysis, the mass deposited at electrode proportional to :

answered Oct 24, 2019 by meena.clay6

1 answer

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistance :

answered Oct 24, 2019 by meena.clay6

1 answer

A car battery of emf 12 V and internal resistance $5\times10^{-2}\Omega$, receives a current of 60 Å from external source, then terminal voltage of battery is :

answered Oct 24, 2019 by meena.clay6

1 answer

Who evaluated the mass of electron indirectly with help of charge :

answered Oct 24, 2019 by meena.clay6

1 answer

Nuclear – Fission is best explained by :

answered Oct 24, 2019 by meena.clay6

1 answer

Two spherical bob of masses $M_A$ and $M_B$ are hung vertically from two strings of length $l_A$ and $l_B$ respectively. They are excuting SHM with frequency relation $f_A$ =$2f_B$ , Then :

answered Oct 24, 2019 by meena.clay6

1 answer

For the adjoining diagram, a triangular lamina is shown the correct relation between $I_1$, $I_2$ & $I_3$ is (I – moment of inertia)

answered Oct 24, 2019 by meena.clay6

1 answer

The bob of simple pendulum having length l, is displaced from mean position to an angular position $\theta$ with respect to vertical. If it is released, then velocity of bob at lowest position :

answered Oct 24, 2019 by meena.clay6

1 answer

Given Truth table is correct for :

answered Oct 24, 2019 by meena.clay6

1 answer

The ratio (W/Q) for a carnot – engine is $\frac{1}{6}$ ,Now the temp. of sink is reduced by 62ºC, then this ratio becomes twice, therefore the initial temp. of the sink and source are respectively :

answered Oct 23, 2019 by meena.clay6

1 answer

The relation between $\lambda$ and $T_\frac{1}{2}$ is : ( $T_\frac{1}{2}$= half life , $\lambda\rightarrow decay constant$ )

answered Oct 23, 2019 by meena.clay6

1 answer

A string is cut into three parts, having fundamental frequencies $n_1$, $n_2$ and $n_3$ respectively. Then original fundamental frequency 'n' related by the expression as :

answered Oct 21, 2019 by meena.clay6

1 answer

Two stationary sources each emitting waves of wave length $\lambda$. An observer moves from one source to other with velocity u. Then number of beats heared by him :

answered Oct 21, 2019 by meena.clay6

1 answer

The value of quality factor is :

answered Oct 21, 2019 by meena.clay6

1 answer

A charge having q/m equal to $10^8$ c/kg and with velocity $3 × 10^5$ m/s enters into a uniform magnetic field $B = 0.3$ tesla at an angle $30^{\circ}$ with direction of field. Then radius of curvature will be :

answered Oct 21, 2019 by meena.clay6

1 answer

For adjoining fig., The magnetic field at point, 'P' will be : 5A P 2.5A 2.5 m 5m

answered Oct 18, 2019 by meena.clay6

1 answer

A charge Q the electric flux passed through all the six faces of the cube is :

answered Oct 18, 2019 by meena.clay6

1 answer

Motion of a particle is given by equation $S=({3t^3}+{7t^2}+14 t+8)m$ The value of acceleration of the particle at t = 1 sec. is :

answered Oct 18, 2019 by meena.clay6

1 answer

The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river with shortest will possible path in 15 min. Then the velocity of river stream is :

answered Oct 18, 2019 by meena.clay6

1 answer

Electric field atcentre O of semicircle of radius 'a' having linear charge density $\lambda$ given is given by O a

answered Oct 18, 2019 by meena.clay6

1 answer

The frequency order of for $\gamma$- rays b, X – rays a, UV – rays(c):

answered Oct 18, 2019 by meena.clay6

1 answer

To find out degree of freedom, the correct expression is :

answered Oct 18, 2019 by meena.clay6

1 answer

For a plane convex lenx $(\mu = 1.5)$ has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering :

answered Oct 18, 2019 by meena.clay6

1 answer

Gravitational force is required for :

answered Oct 16, 2019 by meena.clay6

1 answer

Rainbow is formed due to :

answered Oct 16, 2019 by meena.clay6

1 answer

A body of weight 72 N moves from the surface of earth at a height half of the radius of the earth, then gravitational force exerted on it will be :

answered Oct 16, 2019 by meena.clay6

2 answers

For the given reaction, the particle X is : ${6^C}^{11}\rightarrow{5^B}^{11}+\beta^+{+}X$

answered Oct 16, 2019 by meena.clay6

1 answer

A mass is performing vertical circular motion (see figure).If The average velocity of the particle is increased, then at which point the string will break :

answered Oct 16, 2019 by meena.clay6

1 answer

Two projectiles of same mass and with same velocity are thrown at an angle 60º & 30º with the horizontal, then which quantity will remain same :

answered Oct 16, 2019 by meena.clay6

1 answer

A capacitor is charged with a battery and energy stored is U. After disconnecting battery another capacitor of same capacity is connected in parallel with it. Then energy stored in each capacitor is :

answered Oct 16, 2019 by meena.clay6

1 answer

Calculate the net resistance of the circuit between A and B :

answered Oct 8, 2019 by meena.clay6

1 answer

A mass of 1kg is thrown up with a velocity of 100 m/s. After 5 seconds, it explodes into two parts. One part of mass 400 g comes down with a velocity 25 m/s Calculate the velocity of other part :

answered Oct 8, 2019 by meena.clay6

1 answer

A body of mass 3 kg hits a wall at an angle of $60^{\circ}$ & returns at the same angle. The impact time was 0.2 s. Calculate the force exerted on the wall :

answered Oct 8, 2019 by meena.clay6

1 answer

Two masses as shown are suspended from a massless pulley. Calculate the acceleration of the system when masses are left free :

answered Oct 8, 2019 by meena.clay6

1 answer

For the disproportionation of copper :$2Cu^+\rightarrow Cu^{+2}+Cu$, Eº is : - (Given Eº for $\frac{Cu^{+2}}{Cu}$ is 0.34 V & Eº for $\frac{Cu^{+2}}{Cu^+ }$is 0.15 V :

answered Sep 13, 2019 by meena.clay6

1 answer

At 27ºC latent heat of fusion of a compound is 2930 J/mol. Entropy change is :

answered Sep 11, 2019 by sharmaaparna1

1 answer

$2Zn+O_2\rightarrow 2ZnO$ $\bigtriangleup Gº $= – 616 J $2Zn+S_2\rightarrow 2ZnS$ $\bigtriangleup Gº$ = – 293 J $S_2+2O_2 \rightarrow 2SO_2$ $\bigtriangleup Gº$ = – 408 J $\bigtriangleup Gº$ for the following reaction is :$2ZnS+3O_2 \rightarrow 2ZnO+ 2SO_2$

answered Sep 11, 2019 by sharmaaparna1

1 answer

At infinite dilution equivalent conductances of $Ba^{+2}$ & $Cl^-$ ions are 127 & $76ohm^{-1}$ $cm^{-1}$ $eq^{-1}$ respectively. Equivalent conductance of $BaCl_2$ at infinite dilutions is :

answered Sep 11, 2019 by sharmaaparna1

1 answer

Cell reaction is spontaneous when :

answered Sep 11, 2019 by sharmaaparna1

1 answer

Which species does not exhibits paramagnetism :

answered Sep 11, 2019 by sharmaaparna1

2 answers

What shall be the effect of destruction of wild life :

asked Jul 20, 2018 by pady_1

1 answer

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