In any fission process, the ratio Mass of fission products/Mass of parent nucleus is
In a transformer, the output current and voltage are respectively 4 A and 20 V. If ratio of no. of turns in primary to secondary is 2:1, what is the input current and voltage?
A cannon ball is fired with a velocity 200 m/sec at an angle of 60° with the horizontal. At the highest point of its flight it explodes into 3 equal fragments, one going vertically upwards with velocity 100 m/sec, the second one falling vertically downwards with a velocity 100 m/sec. The third fragment will be moving with a velocity
A string can withstand a tension of 50 Newtons. The greatest speed at which a body of mass 250 gm can be whirled in a circle using 50 cm length of string is—
During execution, OP code of an instruction is stored in the:
A dust particle of mass 10^{−3} gm is stationary between the plates of a horizontal parallel plate capacitor of 0.016m separation which is connected to a voltage of 100V. How many fundamental charges (e = 1.6 x 10 ^{− 19} C) the dust particle carries
n identical cells each of e.m.f. E and internal resistance r are connected in series. An external resistance R is connected in series to this combination. The current through R is
If we express the energy of a photon in KeV and the wavelength in angstroms, then energy of a photon can be calculated from the relation
Which of the following will be σ if Y=2.4η
In an induction coil with resistance, the induced emf will be maximum, when
A body of 5 kg weight kept on a rough inclined plane of angle 30° starts sliding with a constant velocity. Then the coefficient of friction is (assume g = 10 m/s^{2})
A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is
In order that the heat flows from one part of a solid to another part, what is required
Solids expand on heating because
Which of the following statements is not correct about the magnetic field?
Curie temperature of iron is the temperature below which it is
In a surface tension experiment with a capillary tube, water rises upto 8 mm. If the same experiment is repeated on an artificial satellite, which is revoling around the earth, water will tise in capillary tube upto a height of
Three forces acting on a body are shown in the figure. To have the resultant force only along the ydirection, the magnitude of the minimum additional force needed is :
A particle covers 150 m in 8th second starting from rest, its acceleration is
Which of the following is a vector quantity?
A gun fires a bullet of mass 50gm with a velocity of 30m/s. Because of this gun is pushed back with a velocity of 1m/s. Mass of the gun is
If a ring is suspended from a point on a 2.25 m long string, then time period of oscillation will be(take g = 9.8 ms⁻^{2})
The root mean square speed of the molecules of a gas is
A concave mirror of focal length f (in air) is immersed in water (μ = 4/3). The focal length of the mirror in water will be
A cricketer hits a ball with a velocity 25 m/s at 60° above the horizontal. How far above the ground it passes over a fielder 50 m from the bat (assume the ball is struck very close to the ground)
Here ball is hit by cricketer with 25 m/s velocity.
The angle of projection = 60°
Horizontal component of velocity
v_{x} = 25 cos 60° = 12.5 m/s
Vertical component of velocity
Time taken by ball to cover 50 m dustabce
Now the vertical distance covered by the ball is given by
A dics of radius 1 m is rotating with an angular velocity of 10 rads⁻^{1}. The linear velocity of the dics on a point 0.5 m from its centre is
The resultant of two forces 3P and 2P is R. If the first force is doubled then the resultant is also doubled. The angle between the two forces is
Neglecting gravity, the potential energy of a molecule of liquid on the surface of liquid when compared with potential energy of molecule inside the liquid is
If 2.2 kilowatt power is transmitted through a 10 ohm line at 22000 volt, the power loss in the form of heat will be
Two metal rods A and B are having their initial lengths in the ratio 2:3 and coefficients of linear expansion in the ratio 3:4, when they are heated through the same temperature difference, the ratio of their linear expansions is
Consider the following statements
Assertion (A) : In adiabatic compression, the internal energy and temperature of the system get decreased
Reason (R) : The adiabatic compression is a slow process
Of these statements
In C.G.S system the magnitude of the force is 100 dyne. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is
If ratio of amplitude of two waves is 4:3, then ratio of maximum and minimum intensity is
represents an equation of a progressive wave, where t is in second and x is in meter. The distance travelled by the wave in 5 seconds is
A bullet mass 10 gm is fired from a gun of mass 1 kg. If the recoil velocity is 5 m/s, the velocity of the muzzle is
If the bullet and gun is considered a system, the force exerted by trigger will be internal
Now, according to the law of conservation of momentum
Initital momentum of gun = Momentum imparted to bullet and muzzle
⇒ 1000 x 5 = 10 x v
⇒ v (Velocity of muzzle) = 500 ms^{1}
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