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Recent questions tagged physics
Questions
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2m then -
neet
physics
past papers
2003
36
asked
Jul 24, 2018
by
pady_1
1
answer
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about
neet
physics
past papers
2003
35
asked
Jul 24, 2018
by
pady_1
1
answer
Fuse wire is a wire of
neet
physics
past papers
2003
34
asked
Jul 24, 2018
by
pady_1
1
answer
Solar energy is mainly caused due to :
neet
physics
past papers
2003
33
asked
Jul 24, 2018
by
pady_1
1
answer
Three capacitors each of capacity $4 \mu F$ are to be connected in such a way that the effective capacitance of $6 \mu F$. This can be done by -
neet
physics
past papers
2003
32
asked
Jul 24, 2018
by
pady_1
1
answer
In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is :
neet
physics
past papers
2003
31
asked
Jul 24, 2018
by
pady_1
1
answer
An electric kettle has two heating coils. When one of the coils is connected to an a.c. source, the water in the kettle boils in 10 minutes. When the other coil is used the water boils in 40 minutes. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be :-
neet
physics
past papers
2003
30
asked
Jul 24, 2018
by
pady_1
1
answer
Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be :
neet
physics
past papers
2003
29
asked
Jul 24, 2018
by
pady_1
1
answer
A bar magnet is oscillating in the Earth's magnetic field with a period T. What happens to this period and motion if this mass is quadrupled -
neet
physics
past papers
2003
28
asked
Jul 24, 2018
by
pady_1
2
answers
A charged particle moves through a magnetic field in a direction perpendicular to it. Then the
neet
physics
past papers
2003
27
asked
Jul 24, 2018
by
pady_1
1
answer
A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is -
neet
physics
past papers
2003
26
asked
Jul 24, 2018
by
pady_1
1
answer
An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The coulomb force $\overrightarrow{F}$ between the two is - <br> (where $K = \frac{1}{4 \pi \varepsilon_0}$ )
neet
physics
past papers
2003
25
asked
Jul 24, 2018
by
pady_1
1
answer
A charge q is located at the centre of a cube. <br> The electric flux through any face is -
neet
physics
past papers
2003
24
asked
Jul 24, 2018
by
pady_1
1
answer
The potential energy of a simple harmonic oscillator when the particle is half way to its end point is -
neet
physics
past papers
2003
23
asked
Jul 24, 2018
by
pady_1
1
answer
Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is -
neet
physics
past papers
2003
22
asked
Jul 24, 2018
by
pady_1
1
answer
An ideal gas heat engine operates in a carnot cycle between $227^{\circ}C$ and $127^{\circ}C$. It absorbs 6 kcal at the higher temperature. The amount of heat (in kcal) converted into work is equal to -
neet
physics
past papers
2003
21
asked
Jul 24, 2018
by
pady_1
1
answer
We consider the radiation emitted by the human body. Which of the following statements is true :
neet
physics
past papers
2003
20
asked
Jul 24, 2018
by
pady_1
1
answer
A equiconvex lens is cut into two halves along (i) XOX' and (ii) YOY' as shown in the figure. Let f, f' f" be the focal lengths of the complete lens, of each half in case (i), and of each half in case (ii), respectively Choose the correct statement from the following-
neet
physics
past papers
2003
19
asked
Jul 24, 2018
by
pady_1
1
answer
In case of a forced vibration, the resonance wave becomes very sharp when the :
neet
physics
past papers
2003
18
asked
Jul 24, 2018
by
pady_1
1
answer
A particle of mass m oscillates with simple harmonic motion between points $x_1$ and $x_2$, the equilibrium position being O. Its potential energy is plotted. It will be as given below in the graph :
neet
physics
past papers
2003
17
asked
Jul 24, 2018
by
pady_1
1
answer
The time period of a mass suspended from a spring is T. If is the spring is cut into four equal parts and the same mass is suspend from one of the parts, then the new time period will be -
neet
physics
past papers
2003
16
asked
Jul 24, 2018
by
pady_1
1
answer
An observer moves towards a stationary source of sound with a speed $1/5^{th}$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda$ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively :
neet
physics
past papers
2003
15
asked
Jul 24, 2018
by
pady_1
1
answer
A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
neet
physics
past papers
2003
14
asked
Jul 24, 2018
by
pady_1
2
answers
A man throws ball with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two balls are in the sky at any time ? (Given $g = 9.8 m/s^2$)
neet
physics
past papers
2003
13
asked
Jul 24, 2018
by
pady_1
1
answer
Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses in now filled with a liquid of specific density 3. The gravitational force will now be :
neet
physics
past papers
2003
12
asked
Jul 24, 2018
by
pady_1
2
answers
The vector sum of two forces is perpendicular to their vector differences. In that case, the forces :
neet
physics
past papers
2003
11
asked
Jul 24, 2018
by
pady_1
1
answer
A ball rolls without slipping. The radius of gyration of the ball about an axis passing through its centre of mass is K. If radius of the ball be R, then the fraction of total energy associated with its rotational energy will be :
neet
physics
past papers
2003
10
asked
Jul 24, 2018
by
pady_1
1
answer
A man weighs 80 kg He stands on a weighing scale in a lift which is moving upwards with a uniform acceleration of $5m/s^2$. What would be the reading on the scale ? ($g = 10 m/s^2$)
neet
physics
past papers
2003
9
asked
Jul 24, 2018
by
pady_1
2
answers
A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope ? ($g = 10 m/s^2$)
neet
physics
past papers
2003
8
asked
Jul 24, 2018
by
pady_1
1
answer
The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B.
neet
physics
past papers
2003
7
asked
Jul 24, 2018
by
pady_1
1
answer
When a long spring is stretched by 2 cm, its potential energy is U. If the spring is stretched by 10 cm, the potential energy stored in it will be :
neet
physics
past papers
2003
6
asked
Jul 24, 2018
by
pady_1
1
answer
A solid cylinder of mass M and radius R rolls without slipping down an inclined plane of length L and height h. What is the speed of its centre of mass when the cylinder reaches its bottom -
neet
physics
past papers
2003
5
asked
Jul 24, 2018
by
pady_1
1
answer
A stationary particle explodes into two particles of masses $m_1$ and $m_2$ which move in opposite directions with velocities $v_1$ and $v_2$. The ratio of their kinetic energies $\frac{E_1}{E_2}$ is :
neet
physics
past papers
2003
4
asked
Jul 24, 2018
by
pady_1
1
answer
A thin circular ring M and radius ‘r’ is rotating about its axis with a constant angular velocity $\omega$. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be -
neet
physics
past papers
2003
3
asked
Jul 24, 2018
by
pady_1
1
answer
A particle moves along a circle of radius $\frac{20}{\pi}$ m with constant tangential acceleration. If the velocity of the particle is $80 m/s at the end of the second revolution after motion has begun, the tangential acceleration is : -
neet
physics
past papers
2003
2
asked
Jul 24, 2018
by
pady_1
1
answer
If a ball is thrown vertically upwards with speed u, the distance covered during the last ‘t’ seconds of its ascent is :
neet
physics
past papers
2003
1
asked
Jul 24, 2018
by
pady_1
1
answer
which of the following is not projectile motion
physics
asked
Jul 24, 2018
by
moosa0185
1
answer
Speed of electron in hydrogen in it's ground state
physics
asked
Jul 24, 2018
by
sunilganja00
1
answer
A bus starts from rest with a constant acceleration of 5m/s².at the same t
physics
asked
Jul 24, 2018
by
abhivijayach
1
answer
A body falls from a height h on a horizontal surface and rebounds. Then it
physics
asked
Jul 24, 2018
by
chinmoyeebhuyan5
1
answer
Three blocks are connected on a horizontal table if m1=1kg,m2=8kg,m3=27kgan
physics
asked
Jul 24, 2018
by
yashnareshlachure
1
answer
what is melting point?
physics
asked
Jul 23, 2018
by
souravmitra744
1
answer
Resistance r equal vPhone I Where V equal hundred plus minus 5 and I 10 + -
physics
asked
Jul 23, 2018
by
mkmahesh28198
1
answer
Measurements of a conductive wire is3.20,3.30,3.50 than find out the mean a
physics
asked
Jul 23, 2018
by
mkmahesh28198
1
answer
A energy of a photon of sodium light equal to the band gap of a semiconduct
physics
asked
Jul 23, 2018
by
rashmi.ranjan7643
0
answers
In the biprism experiment with the light of wavelength 7000A° , 10 bright
physics
asked
Jul 23, 2018
by
nunpuiavanlal485
1
answer
Time period proportional to p d e where p is pressure d is density and e is
physics
asked
Jul 23, 2018
by
harshitasahani10
1
answer
Terminal velocity of small sphere falling through a viscous medium depends
physics
asked
Jul 23, 2018
by
harshitasahani10
0
answers
how will drift velocity of the electron change if potential difference appl
physics
asked
Jul 23, 2018
by
mamatakumarineupane
1
answer
The value of acceleration due to gravity is 9.8 metre/sec2 its value in km/
physics
asked
Jul 23, 2018
by
harshitasahani10
1
answer
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