Physics-
A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are respected by
Physics-General
Answer:The correct answer is: The forces acting on the ball will be (i) in the direction opposite to its motion 
frictional force and(ii) weight 
.
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physics-
Four capacitors are connected as shown in figure. The equivalent capacitance between 
and 
is
Capacitance between A and B
Four capacitors are connected as shown in figure. The equivalent capacitance between and is
physics-General
Capacitance between A and B
maths-
The ellipse 
and the straight line y = mx + c intersect in real points only if
= 1Þ (b2 + a2 m2) x2 + 2 mca2 x + a2 (c2 - b2) = 0
D > 0 Þ m2c2a4 - a2 (c2 - b2)(b2 + a2m2) > 0 Þ b2 + a2m2 > c2
The ellipse and the straight line y = mx + c intersect in real points only if
maths-General
= 1Þ (b2 + a2 m2) x2 + 2 mca2 x + a2 (c2 - b2) = 0
D > 0 Þ m2c2a4 - a2 (c2 - b2)(b2 + a2m2) > 0 Þ b2 + a2m2 > c2
physics-
A ball of mass
kg is attached to the end of a string having length 
0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in rad/s) is
component will cancel 
Component will provide necessary centripetal force the ball towards center C.
A ball of mass kg is attached to the end of a string having length 0.5 m. The ball is rotated on a horizontal circular path about vertical axis. The maximum tension that the string can bear is 324 N. The maximum possible value of angular velocity of ball (in rad/s) is
physics-General
component will cancel Component will provide necessary centripetal force the ball towards center C.physics-
Three identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle is 
, then the ratio of tensions in the three sections of the string is
Let 
is the angular speed of revolution
is the angular speed of revolutionThree identical particles are joined together by a thread as shown in figure. All the three particles are moving in a horizontal plane. If the velocity of the outermost particle is , then the ratio of tensions in the three sections of the string is
physics-General
Let is the angular speed of revolution
is the angular speed of revolutionphysics-
a) Name the experiment for which the adjacent graph, showing the variation of intensity of scattered electrons with the angle of scatter ing (q) was obtained.
b) Also name the important hypothesis that was confirmed by this experiment
a) Name the experiment for which the adjacent graph, showing the variation of intensity of scattered electrons with the angle of scatter ing (q) was obtained.
b) Also name the important hypothesis that was confirmed by this experiment
physics-General
physics-
Two particles 1 and 2 are projected with same speed 
as shown in figure. Particle 2 is on the ground and particle 1 is at a height 
from the ground and at a horizontal distance 
from particle 2. If a graph is plotted between and for the condition of collision of the two then ( on 
-axis and on 
-axis
Assuming particle 2 to be at rest, substituting in
We have
or
Which is a straight line passing through origin with slope
We have
or
Which is a straight line passing through origin with slope
Two particles 1 and 2 are projected with same speed as shown in figure. Particle 2 is on the ground and particle 1 is at a height from the ground and at a horizontal distance from particle 2. If a graph is plotted between and for the condition of collision of the two then ( on -axis and on -axis
physics-General
Assuming particle 2 to be at rest, substituting in
We have
or
Which is a straight line passing through origin with slope
We have
or
Which is a straight line passing through origin with slope
physics-
From an inclined plane two particles are projected with same speed at same angle 
, one up and other down the plane as shown in figure. Which of the following statements 
is/are correct?
Here, 
Time of flight of is, 
Time of flight of is, 
So,
. The acceleration of both the particles is 
downwards. Therefore, relative acceleration between the two is zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards 
, therefore collision will take place between the two in mid air.
Time of flight of
is, Time of flight of
is, So,
. The acceleration of both the particles is downwards. Therefore, relative acceleration between the two is zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards , therefore collision will take place between the two in mid air.From an inclined plane two particles are projected with same speed at same angle , one up and other down the plane as shown in figure. Which of the following statements is/are correct?
physics-General
Here,
Time of flight of is,
Time of flight of is,
So,. The acceleration of both the particles is downwards. Therefore, relative acceleration between the two is zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards , therefore collision will take place between the two in mid air.
Time of flight of
is, Time of flight of
is, So,
. The acceleration of both the particles is downwards. Therefore, relative acceleration between the two is zero or relative motion between the two is uniform. The relative velocity of w.r.t. is towards , therefore collision will take place between the two in mid air.physics-
A frictionless track 
ends in a circular loop of radius 
figure. A body slides down the track from point which is at a height 
cm. Maximum value of 
for the body to successfully complete the loop is
For successfully completing the loop,
A frictionless track ends in a circular loop of radius figure. A body slides down the track from point which is at a height cm. Maximum value of for the body to successfully complete the loop is
physics-General
For successfully completing the loop,
physics-
In a photoelectric experiment anode potential is plotted against plate current
In a photoelectric experiment anode potential is plotted against plate current
physics-General
physics-
In a circuit shown in figure, the potential difference across the capacitor of 2 F is
In a circuit shown in figure, the potential difference across the capacitor of 2 F is
physics-General
physics-
The effective capacitance between points 
and 
shown in figure. Assuming 
F and that outer capacitors are all 
F is
The arrangement shows a Wheatstone bridge.
As
therefore the bridge is balanced.
Similarly,
effective capacitance
As
therefore the bridge is balanced.Similarly,
effective capacitanceThe effective capacitance between points and shown in figure. Assuming F and that outer capacitors are all F is
physics-General
The arrangement shows a Wheatstone bridge.
Astherefore the bridge is balanced.
Similarly,
effective capacitance
As
therefore the bridge is balanced.Similarly,
effective capacitancephysics-
The two lines A and B shown in figure are the agraphs of the de Broglie wavelength l as function of 
(V is the accelerating potential) for two particles having the same charge 
Which of the two represents the particle of heavier mass ?
The two lines A and B shown in figure are the agraphs of the de Broglie wavelength l as function of (V is the accelerating potential) for two particles having the same charge
Which of the two represents the particle of heavier mass ?
physics-General
physics-
The four capacitors, each of 25 
F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is
Charge on each plate of each capacitor
The four capacitors, each of 25 F are connected as shown in figure. The DC voltmeter reads 200 V. the change on each plate of capacitor is
physics-General
Charge on each plate of each capacitor
physics-
For the circuit shown in figure the charge on 4F capacitor is
Combined capacity of 
and 
= 1 + 5=
Now,
and 
are in series.
Charge in the arm containingcapacitor is
and = 1 + 5=Now,
and are in series.Charge in the arm containing
capacitor isFor the circuit shown in figure the charge on 4F capacitor is
physics-General
Combined capacity of and = 1 + 5=
Now,and are in series.
Charge in the arm containingcapacitor is
and = 1 + 5=Now,
and are in series.Charge in the arm containing
capacitor isphysics-
The respective angles of the flint and crown glass prisms are 
and A. They are to be used for dispersion without deviation, then the ratio of their angles 
will be
Since 
The respective angles of the flint and crown glass prisms are and A. They are to be used for dispersion without deviation, then the ratio of their angles will be
physics-General
Since