AP EAPCET 2021 - 19th August Evening Shift

A bulb of resistance \(280 \Omega\) is supplied with a 200 V AC supply. What is the peak current?

The ionisation potential of hydrogen atom is
13.6 V. How much energy need to be
supplied to ionise the hydrogen atom in the
first excited state?

Which of the following statement is correct?

Four capacitors with capacitances \(C_1=l \propto \mathrm{F}, C_2=1.5 \propto \mathrm{F}, C_3=2.5 \propto \mathrm{F}\) and \(C_4=0.5 \propto \mathrm{F}\) are connected as shown and are connected to a \(30 \mathrm{~V}\) source. The potential...

A 500 kg car takes a round turn of radius
50 m with a velocity of 36 km/h. The
centripetal force acting on the car is

A motor cyclist wants to drive in horizontal circles on the vertical inner surface of a large cylindrical wooden well of radius \(8.0 \mathrm{~m}\), with minimum speed of \(5 \sqrt{5} \mathrm{~ms}^{-1}\). The minimum value of coefficient of...

In a potentiometer of 10 wires, the balance
point is obtained on the 6th wire. To shift the
balance point to 8th wire, we should

The length of germanium rod is \(0.925 \mathrm{~cm}\) and its area of cross-section is \(1 \mathrm{~mm}^2\). If for germanium $$n_i=2.5 \times 10^{19} \mathrm{~m}^{-3}, \propto_n=0.19 \mathrm{~m}^2 / \mathrm{V}-\mathrm{s}, \propto_e=0.39 \m...

The de-Broglie wavelength associated with a
proton under the influence of an electric
potential of 100 V is

Young's modulus of a wire is \(2 \times 10^{11} \mathrm{Nm}^{-2}\). If an external stretching force of \(2 \times 10^{11} \mathrm{~N}\) is applied to a wire of length \(L\). The final length of the wire is (cross-section = unity)

A solenoid of length \(60 \mathrm{~cm}\) with 15 turns per \(\mathrm{cm}\) and area of cross-section \(4 \times 10^{-3} \mathrm{~m}^2\) completely surrounds another co-axial solenoid of same length and area of cross-section $$2 \times 10^{-...

The magnetic field of a plane electromagnetic wave is given by \(B=(400 \propto \mathrm{T})\sin \left[\left(4.0 \times 10^{15} \mathrm{~s}^{-1}\right)\left(t-\frac{x}{c}\right)\right]\). Average energy density corresponding to the electric ...

In an amplitude modulated signal, the maximum amplitude is \(15 \mathrm{~V}\) and minimum amplitude is \(5 \mathrm{~V}\). The amplitude of modulating wave will be

Gauss's law helps in

Charge on the outer sphere is \(q\) and the inner sphere is grounded. The charge on the inner sphere is \(q^{\prime}\), for \(\left(r_2 > r_1\right)\). Then,

Identify the incorrect statement regarding Reynold's number \(\left(R_e\right)\).

The distance through which one has to dig
the Earth from its surface, so as to reach the
point where the acceleration due to gravity is
reduced by 40% of that at the surface of the
Earth, is (radius of Earth is 6400 km)

Infinite number of masses each of 3kg are
placed along a straight line at the distances
of 1 m, 2m, 4m, 8m, ...... from a point O on
the same line. If G is the universal gravitational constant, then the magnitude of
gravitational field inte...

Expansion during heating

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Which of the following is not a reversible
process?

Which one of the graphs below best
illustrates the relationship between internal
energy U of an ideal gas and temperature T of
the gas in K?

A refrigerator with coefficient of
performance 0.25 releases 250 J of heat to a
hot reservoir. The work done on the working
substance is

A vessel has 6 g of oxygen at pressure p and
temperature 400 K. A small hole is made in
it, so that oxygen leaks out. How much
oxygen leaks out if the final pressure is p/2
and temperature is 300 K?

Two blocks \(A\) and \(B\) of masses \(4 \mathrm{~kg}\) and \(6 \mathrm{~kg}\) are as shown in the figure. A horizontal force of \(12 \mathrm{~N}\) is required to make \(A\) slip over \(B\). Find the maximum horizontal force \(F_B\) that ca...

A particle of mass m is projected with a
velocity u making an angle \(\theta\) with the
horizontal. The magnitude of angular
momentum of the projectile about the point
of projection when the particle is at its
maximum height is

An object travelling at a speed of 36 km/h
comes to rest in a distance of 200 m after the
brakes were applied. The retardation
produced by the brakes is

A ball is projected upwards. Its acceleration
at the highest point is

In a co-axial, straight cable, the central conductor and the outer conductor carry equal currents in opposite directions. The magnetic field is zero

The magnetic field, of a given length of wire
for single turn coil, at its centre is B, then its
value for two turns coil for the same wire is

Light of wavelength \(300 \mathrm{~nm}\) in medium \(A\) enters into medium \(B\) through a plane surface. If the frequency of light is \(5 \times 10^{14} \mathrm{~Hz}\) and the ratio of speed in medium \(A\) to that in medium \(B\) is $$4 ...

A sphere of mass m is attached to a spring of
spring constant k and is held in unstretched
position over an inclined plane as shown in
the figure. After letting the sphere go, find
the maximum length by which the spring
extends, given the s...

A girl of mass M stands on the rim of a
frictionless merry-go-round of radius R and
rotational inertia I, that is not moving. She
throws a rock of mass m horizontally in a
direction that is tangent to the outer edge of
the merry-go-round. T...

A block of mass \(\mathrm{l} \mathrm{kg}\) is fastened to a spring of spring constant of \(100 ~\mathrm{Nm}^{-1}\). The block is pulled to a distance \(x=10 \mathrm{~cm}\) from its equilibrium position \((x=0 \mathrm{~cm})\) on a frictionle...

The scale of a spring balance which can measure from 0 to \(15 \mathrm{~kg}\) is \(0.25 \mathrm{~m}\) long. If a body suspended from this balance oscillates with a time period \(\frac{2 \pi}{5} \mathrm{~s}\), neglecting the mass of the spri...

The speed of ripples \((v)\) on water surface depends on surface tension \((\sigma)\), density \((\rho)\) and wavelength \((\lambda)\). Then, the square of speed \((v)\) is proportional to

In Young’s double slit experiment, the
separation between the slits is halved and the
distance between the screen is doubled. The
fringe width is

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What is the shape of the graph between
speed and kinetic energy of a body?

A quarter horse power motor runs at a speed
of 600 rpm. Assuming 60% efficiency, the
work done by the motor in one rotation is