Recent questions tagged 1998

If $x = 3 – 4t^{2} + t^{3},$ then work done in first $4s$. will be (Mass of the particle is 3 gram) :

asked Jun 15, 2018 by pady_1

1 answer

A circular ring of mass M and radius R is rotating about its axis with constant angular velocity $\omega$. Two particle each of mass m are attached gently to the opposite ends of a diameter of the ting. The angular velocity of the ring will now become :

asked Jun 15, 2018 by pady_1

2 answers

For protecting a magnetic needle it should be placed :

asked Jun 15, 2018 by pady_1

2 answers

Two pendulums suspended from same point having length 2m and 0.5m. If they displaced slightly and released then they will be in same phase, when small pendulum will have completed :

asked Jun 15, 2018 by pady_1

1 answer

For a wave $y = y_{0} \sin (\omega t – kx),$ for what value of $\lambda$ is the maximum particle velocity equal to two times the wave velocity :

asked Jun 15, 2018 by pady_1

1 answer

Following logic gate is : <br>

asked Jun 15, 2018 by pady_1

1 answer

Following table is for which logic gate : <br>

asked Jun 15, 2018 by pady_1

1 answer

A hollow sphere of radius 1m is given a positive charge of $10\mu C$. The electric field at the centre of hollow sphere will be :

asked Jun 15, 2018 by pady_1

1 answer

Boron has two isotopes $_5B^{10}$ and $_5B^{11}$. If atomic weight of Boron is 10.81 then ratio of $_5B^{10}$ to $_5B^{11}$ in nature will be :

asked Jun 15, 2018 by pady_1

2 answers

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to :

asked Oct 10, 2017 by priyanka.c

0 answers

A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force $F \sin ωt$. If the amplitude of the particle is maximum for $ω = ω_1$ and the energy of the particle maximum for $ω = ω_2$, then :

asked Oct 10, 2017 by priyanka.c

0 answers

We consider a thermodynamic system. If $\Delta U$ represents the increase in its internal energy and $W$ the work done by the system, which of the following statement is true?

asked Oct 10, 2017 by priyanka.c

2 answers

Common emitter circuit is used as amplifier, its current gain is 50. If input resistance is $1 K \Omega$ and input voltage is 5 volt then output current will be :

asked Oct 10, 2017 by priyanka.c

0 answers

The cause of potential barrier in a P-N junction diode is :

asked Oct 10, 2017 by priyanka.c

1 answer

Radiation energy corresponding to the temperature T of the sun is E. If its temperature is doubled, then its radiation energy will be :

asked Oct 10, 2017 by priyanka.c

0 answers

A rigid rod is placed against the wall as shown in figure. When its velocity of lower end is $10 \;ms^{-1}$ and its base makes an angle $\alpha = 60^{\circ}$ with horizontal, then the vertical velocity of its end B will be :

asked Oct 10, 2017 by priyanka.c

0 answers

For nuclear reaction : <br> $_{92}U^{235} + _0n^1 \to _{56}Ba^{144} + ......... + 3_0n^1$

asked Oct 10, 2017 by priyanka.c

0 answers

If a source moves perpendicularly from listener then the change in frequency will be

asked Oct 10, 2017 by priyanka.c

0 answers

Turn ratio of a step-up transformer is $1 : 25$. If current in load coil is $2A$, then the current in primary coil will be :

asked Oct 10, 2017 by priyanka.c

0 answers

Electric field at the equator of a dipole is E. If strength and distance is now doubled then the electric field will be :

asked Oct 10, 2017 by priyanka.c

0 answers

In the Bohr model of H-atom, an electron (e) is revolving around a proton (p) with velocity v, if r is the radius of orbit and m is mass and $\varepsilon_0$ is vacuum permittivity, the value of v is :

asked Oct 10, 2017 by priyanka.c

1 answer

A charge q is placed in an uniform electric field E. If it is released, then the K.E of the charge after travelling distance y will be :

asked Oct 10, 2017 by priyanka.c

0 answers

A car is moving with velocity V. If stop after applying break at a distance of 20 m. If velocity of car is doubled, then how much distance it will cover (travel) after applying break :

asked Oct 10, 2017 by priyanka.c

0 answers