Phy101 past papers | VU past papers

Phy101 past paper question are given for preparation of final term exam 2023. Past papers mostly include repeated questions so that reading past papers help students to get good grades. Students also acknowledge the type of questions asked in paper & paper pattern. SO, students must read vu past papers along with handout content.

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Past Paper questions Phy101

Question 1
Two people are carrying a uniform wooden board that is 3.00 m long and
weighs 160 N. If one person applies an upward force equal to 60 N at one
end,
at what point does the other person lift? Begin with a free-body diagram of
the
board.
Forces in x direction = 0
Forces in Y = F1 + F2 – W
Given:
L = 3.00 m F1 = 60 N
W = 160 N F2 = ? and x2 = ?
Sum of forces and torques = 0
Sum Force = F1 + F2 – W = 0
60N + F2 – 160 N = 0
F2 = 100 N
My pivot point is at F2.
Sum of torques = 0
Torque F1 = F1(L – x2)
Torque F2 = 0 b/c at pivot point
Torque W = W(L/2 – x2)
F1L – F1x2 + (WL)/2 – Wx2 = 0
(60)(3) – 60×2 + (160 * 3)/2 – 160×2 = 0
180-60×2 + 240-160×2 = 0
420-220×2 = 0
x2 = 1.9m
Question 2

If a charged particle moves in a straight line through some region of space,
can
you say that the magnetic field in that region is zero?
Question 3

You want to explore the shape of a cel1ain molecule by scattering electrons
of
momentum p from a gas of the molecules and studying the deflection of the
electrons. You will be able to see finer details in the molecules by (a)
increasing p; (b) decreasing p: (c) not worrying what p is.


Question 4

A vessel is filled with gas at some equilibrium pressure and temperature.
Can all gas molecules in the vessel have the same speed?
Question 5

What are the properties of wave function?
Wave functions contain all the measurable information about the particles
Wave functions are continuous.
They allow energy calculations via Schrodinger equation.
They establish the probability distribution in three dimensions.
They permit calculation of most probable values of given variables.
Question 6

A bike accelerates uniformly from rest to a speed of 7.10 m/s over a distance
of
35.4 m. Determine the acceleration of the bike.
2as = vf2 – vi2
2a(35.4) = (7.10)2 – (0)2
2a(35.4) = 50.41
A = .71 m/s2
Question 7

A flat loop of wire consisting of a single turn of cross-sectional area 8.00
cm2 is
perpendicular to a magnetic field that increases uniformly in magnitude from
0.500 T to 2.50 T in 1.00 s. What is the resulting induced current if the loop
has a resistance of 2.00 W?
E=(Bf-Bi)A/t=(2.5-0.5)810-4/1=1.610-3 V
I=E/R=1.23 mA


Question 8

An ideal gas is contained in a vessel at 300 K. If the temperature is increased
to
900 K, by what factor does each one of the following change?
(a) The average kinetic energy of the molecules.
(b) The rms molecular speed.
(c) The average momentum change of one molecule in a collision with a
wall.
(d) The rate of collisions of molecules with walls.
(e) The pressure of the gas.
Question 9

Who discover the nucleus? Write the experimental setup that he follows.
Ans:
Lord Rutherford discovered the nucleus. He carried out his famous
experiment that showed the existence of a small but very heavy core of the
atom. He arranged for a beam of alpha particles to strike gold atoms in a thin
foil of gold. If the positive and negative charges in the atom were randomly
distributed, all ‘ would go through without any deflection. But a lot of
backscattering was seen, and some alphas were even deflected back in the
direction of the incident beam. This was possible only if they were colliding
with a very heavy object inside the atom.

Question 10

an analogy between electric current and automobile traffic flow, what would
correspond to charge? What would correspond to current?

Question 11

(a)When can you expect a body to emit blackbody radiation?
(b) Which law is obeyed by Sun and other stars, briefly explain it.
(a) When can you expect a body to emit blackbody radiation?
Ans:
Waves are emitted when charges accelerate. Blackbody radiation occurs for
exactly this reason as well. If a body is heated up, the electrons, atoms, and
molecules which it contains undergo violent random motion. Light may emit
by electrons in one atom and absorbed in another. Even an empty box will
be
filled with blackbody radiation because the sides of the box are made up of
material that has charged constituents that radiate energy when they undergo
acceleration during their random motion. A blackbody is both an ideal
absorber and an ideal radiator. At high temperature, a body emits radiation
of
shorter wavelength. Temperature is inversely proportional to wavelength.
(b) Which law is obeyed by Sun and other stars, briefly explain it.
Ans:
The Sun and other stars obey Wien’s Law since the gases they are composed
of emit radiation that is in equilibrium with the other materials. Wien’s law
allows astronomers to determine the temperature of a star because the
wavelength at which a star is brightest is related to its temperature.

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