پرسیاری وزاری فیزیا 2022-2023 خولی دووەم ، خوێندنی ئینگلیزی

A wave whose particles vibrate perpendicular to the direction of the wave is traveling

. In which situation, the direction of the magnetic force on a proton moves in a magnetic field is out of the page?

(In the photoelectric effect, if the frequency of incident light is increased with same intensity) Which of the following is true?

Identify which, conditions of equilibrium hold for (a bicycle parked against a curb)?

Which of the following represents the first three harmonics in a pipe closed at one end?

A simple pendulum can be used as an altimeter on a plane. What will happened as the plane rises from the ground to its final cruising altitude of 10⁴ m?

At Which of the seven positions indicated in figure should
the supporting pivot be located to produce a net negative torque?

If the intensity of a sound is (1 W/m²) what is the relative intensity of this sound?

Which of the following summarizes Thomson’s model of the atom?

Two uniformly solid cylinders of equal radii roll down an incline without slipping. The first cylinder has three times
the mass of the second cylinder. The torque was exerted on the first cylinder is ………. torque exerted on the
second cylinder?

A toaster is plugged into a source of alternating emf with an rms value of 110 V. The heating element is designed to convey a current with a maximum value of 10.5 A, The resistance of the heating element?

In the region of which of following waves are (Masers) working?

 The unit of angular momentum is

. Two currents run in opposite direction in two parallel wires A and B at a distance of 1m Apart. if the current I_A is a third of I_B

($I_A=\frac13I_B$)

determine the position of the point along the line normal to the wires where the total magnetic field is zero?

According to ………… principle, any points on the wave front of light can be treated as a new point source of light to produce a new wave

Which of the following must be true for two waves with identical amplitudes and wavelengths to undergo complete destructive interference?

A solenoid of length 50 cm has 2000 turns. Calculate the magnitude of the magnetic field in the middle of the
solenoid when a current of 10 A passes through its turns : μ_o=4πx10^-7T.m/A

What is the magnitude of the magnetic force (F_magnetic) on the electron, when moving perpendicular into the
magnetic field (𝐵⃗ )?

A disk rolls along a horizontal surface at a constant linear speed without slipping .What is the ratio of its
translational kinetic energy to total kinetic energy (KE_{𝐭𝐫𝐚𝐧𝐬𝐥𝐚𝐭𝐢𝐨𝐧𝐚}/KE_total)

A generator coil has 25 turns of wire and a cross-sectional area of 36 cm² . The maximum emf developed in the
generator is 2.8 V at 60 Hz. what is the strength of the magnetic field in which the coil rotates?

A double slit interference experiment is performed using blue light from a hydrogen discharge tube (λ=486 nm) The fifth order bright fringe in the interference pattern is 0.578^o from the central maximum. How far apart are the two slits separated?

If the pendulume number (2) is set inmotion. Which
pendulum will oscillate with larger amplitude?

According to right hand rule, which of following figures correctly describe the direction of current and magnetic field of solenoid?

A car of mass 1000 kg moves in circular truck at constant speed of 25 m/s if the circumference of track is 6280 m, calculate the force that maintains circular motion of car?

How does the restoring force acting on a pendulum bob changes as the bob swings toward the equilibrium
position? How do the bob’s acceleration (along the direction of motion) and velocity change?

Eddy currents are used:

The electrical energy is transferred from power plants to houses and factories

The wheel on an upside-down bicycle moves through 10 rad in 2 s. What is the wheel’s angular acceleration if its
final angular speed is 8 rad/s?

Which solid has a valence band that overlaps the conduction band?

In the electrical circuit is in the adjacent figure
Calculate the Phase difference angle between
the total current and the total potential difference?

The electrical energy is transferred from power plants to houses and factories

How many radians are equal (128^o)?

Which of electromagnetic waves is used easily to measure Compton shift?

A source of frequency

$\frac{100}\pi Hz$

and its effective potential difference is 200 V is connected across a capacitor, if the effective current of the circuit is 10 A, Calculate the maximum charge accumulated across the capacitor?

If the expressions of the instantaneous current and instantaneous potential difference across a pure self-nductance given by

$I_L=2\sqrt2\sin\left(100\pi t\right)$

$V_L=125.6\sin\left(100\pi t+\frac\pi2\right)$‏

calculate the coefficient of self induction of coil?

Which equation is correct to calculate centripetal acceleration?

A simple pendulum of length 0.25 m and period of 1s what will be the period of this pendulum if its length is 1m at same place?

Commutator is not used in:

In figure (Two parallel wires, each carrying a direct current)
Determine the direction of movement of electrons in the wire (2)?

Two successive crests of a transverse wave are 2.4 m apart. Eight crests pass a give point in 12 s. What is the
wave speed?

A potential difference of 0.75 V is needed to provide a large current for arc welding. If the potential difference
across the primary of a step-down transformer is 117 V, what is the ratio of the number of turns of wire on the
primary to the number of turns on the secondary?

(A girl at a state fair swings a ball in a vertical circle at the end of a string) What is the tension force applied by the string at the bottom of the ball’s path?

Which of the following wave lengths will not produce standing waves on a string that is 3.5 m, long?

Which of the following frequencies the emission of electrons from a meatal surface of a work function is (2.3 eV)
occurs when light shines on the surface of the meatal?

h=6.63×10^-34j.s

(An object moves in circle at constant speed) Which of the following is not true for object?

What is another word for “quantum of light”?

In which of the following cases super conductor materials couldn’t be used:

A 10 kg mass is attached to a cord that is wrapped around a wheel with a radius
of 10 cm, as shown in Figure. The acceleration of the mass down the frictionless
incline is measured to be 2 m/s²
. Assuming the axle of the wheel to be frictionless,
determine the moment of inertia of the wheel?

A bat flies towards a fixed wall and sends an ultrasonic wave of frequency (𝑓), Which of the following equations is
correct to calculate the apparent frequency (𝑓́) of this wave when it strikes the wal

In the transistor outer regions are called the (emitter and collector) and the narrow central region is called the base , which of the following is true