shaalaa.com
S

Question Paper - Physics 2015 - 2016-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

Account
User


Login
Register


      Forgot password?
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty
SubjectPhysics
Year2015 - 2016 (March)

notes


Marks: 70
Q: 1 | Attempt any six[12]
Q: 1.1[2]

In U. C. M (Uniform Circular Motion), prove the relation `vec v = vec w xx vec r`, where symbols have their usual meanings.

 
 
view solution
Q: 1.2[2]

Derive an expression for critical velocity of a satellite revolving around the earth in a circular orbit.

view solution
Q: 1.3[2]

Obtain an expression for total kinetic energy of a rolling body in the form

`1/2 (MV^2)[1+K^2/R^2]`

 
view solution
Q: 1.4[2]

Define emissive power and coefficient of emmision of a body.

view solution
Q: 1.5[2]

A coin kept at a distance of 5cm from the centre of a turntable of radius 1.5m just begins to slip when the turntable rotates at a speed of 90 r.p.m. Calculate the coefficient of static friction between the coin and the turntable.

[g = 9.8 m/s2]

view solution
Q: 1.6[2]

The fundamental frequency of an air column in a pipe closed at one end is in unison with the third overtone of an open pipe. Calculate the ratio of lengths of their air columns

view solution
Q: 1.7[2]

A particle performing linear S.H.M. has a period of 6*28 seconds and a pathlength of 20 cm. What is the velocity when its displacement is 6 cm from mean position?

view solution
Q: 1.8[2]

The energy of the free surface of a liquid drop is 5π times the surface tension of the liquid. Find the diameter of the drop in C.G.S. system.

view solution
Q: 2 | Select and write the most appropriate answer from the given alternatives for each sub-question : [7]
Q: 2.1[1]

A particle rotates in U.C.M. with tangential velocity V along a horizontal circle of diameter ‘D' . Total angular displacement of the particle in time 't' is..........

(a) vt

(b) (v/D)-t

(c) vt/2D

(d) 2vt/D



 

view solution
Q: 2.2[1]

Two springs of force constants K1 and K2 (K1> K2) are stretched by same force. If W1 and W2 be the work done stretching the springs then......

(a) W1=W2

(b) W1<W2

(c) W1>W2

(d) W1=W2=0

view solution
Q: 2.3[1]

A and B are two steel wires and the radius of A is twice that of B. If they are stretched by the same load, then the stress on B is .....

(a) four times that of A.

(b) two times that of A.

(c) three times that of A.

(d) same as that of A.

view solution
Q: 2.4[1]

If sound waves are reflected from surface of denser medium, there is phase change of.......

(a) 0 rad                                    

(b) π/4  rad

(c) π/2 rad    

(d) π rad

view solution
Q: 2.5[1]

A sonometer wire vibrates with frequency n1 in air under suitable load of specific gravity of . When the load is immersed in water, the frequency of vibration of wire n2 will be .........

(a)  `n_1sqrt((sigma+1)/sigma)`

(b) `n_1sqrt((sigma-1)/sigma)`

(c) `n_1sqrt(sigma/(sigma+1))`

(d) `n_1sqrt(sigma/(sigma-1))`

 

view solution
Q: 2.6[1]

For polyatomic molecules having 'f' vibrational modes, the ratio of two specific heats,Cp/Cv  is..........

(a) `(1+f)/(2+f)`

(b) `(2+f)/(3+f)`

(c) `(4+f)/(3+f)`

(d) `(5+f)/(4+f)`

view solution
Q: 2.7[1]

A body of moment of inertia 5 kgm2 rotating with an angular velocity 6 rad/s has the same kinetic energy as a mass of 20 kg moving with a velocity of ......

(a) 5 m/s

(b) 4 m/s

(c) 3 m/s

(d) 2 m/s

view solution
Q: 3 | Attempt any one of following :[7]
Q: 3.1[7]

Define linear S.H.M.

view solution

Show that S.H.M. is a projection of  U.C.M. on any diameter

view solution

A metal sphere cools at the rate of 4°C / min. when its temperature is 50°C. Find its rate of cooling at 45°C if the temperature of surroundings is 25°C.

view solution
Q: 3.2[7]

Explain analytically how the stationary waves are formed

view solution

Hence show that the distance between node and adjacent antinode is λ/4

view solution

A set of 48 tuning forks is arranged in a series of descending frequencies such that each fork gives 4 beats per second with preceding one. The frequency of first fork is 1.5 times the frequency of the last fork, find the frequency of the first and 42nd tuning fork

view solution
Q: 4 | Attempt any THREE [9]
Q: 4.1[3]

What is the decrease in weight of a body of mass 600kg when it is taken in a mine of depth 5000m?

[ Radius of earth = 6400km, g = 9.8 m/s2 ]

view solution
Q: 4.2[3]
Q: 4.2.1[1]

State the theorem of parallel axes about moment of inertia.

view solution
Q: 4.2.2[2]

Prove the theorem of parallel axes about moment of inertia

view solution
Q: 4.3[3]

Derive Laplace’s law for spherical membrane of bubble due to surface tension.

view solution
Q: 4.4[3]

A steel wire having cross sectional area 1.5 mm2 when stretched by a load produces a lateral strain 1.5 x 10-5. Calculate the mass attached to the wire.

(Ysteel = 2 x 1011 N/m2, Poisson’s ratio σ = 0.291,g = 9.8 m/s2)

view solution
Q: 5 | Attempt any SIX [12]
Q: 5.1[2]

What is 'diffraction of light' ? Explain its two types.

view solution
Q: 5.2[2]

Draw a neat labelled diagram for the construction of 'cyclotron'

view solution
Q: 5.3[2]

Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.

view solution
Q: 5.4[2]

Write a short note on surface wave propagation of electromagnetic waves.

view solution
Q: 5.5[2]

The combined resistance of a galvanometer of resistance 500Ω and its shunt is 21Ω. Calculate the value of shunt.

view solution
Q: 5.6[2]

The susceptibility of magnesium at 200 K is 1-8 x 10-5. At what temperature will the susceptibility decrease by 6 x 10"6?

view solution
Q: 5.7[2]

The co-efficient of mutual induction between primary and secondary coil is 2H. Calculate induced e.m.f. if current of 4A is cut off in 2.5 x 10-4 seconds

view solution
Q: 5.8[2]

The decay constant of radioactive substance is 4.33 x 10-4 per year. Calculate its half life period.

 

view solution
Q: 6 | Select and write the most appropriate answer from the given alternatives for each sub-question :[7]
Q: 6.1[7]

If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................

(a) `1/sqrt3`

(b) `sqrt(3/2)`

(c) 1

(d) `sqrt3`

view solution
Q: 6.2[1]

The resolving power of a telescope depends upon the...............

(a) length of the telescope

(b) focal length of an objective

(c) diameter of an objective

(d) focal length of an eyepiece

view solution
Q: 6.3[1]

Electric intensity due to a charged sphere at a point outside the sphere decreases with...................

(a)increase in charge on sphere.

(b)increase in dielectric constant.

(c)decrease in the distance from the centre of sphere.

(d)decrease in square of distance from the centre of sphere

view solution
Q: 6.4[1]

In potentiometer experiment, if l1 is the balancing length for e.m.f. of cell of internal resistance r and l2 is the balancing length for its terminal potential difference when shunted with resistance R then :

(a) `l_1=l_2((R+r)/R)`

(b) `l_1=l_2((R)/(R+r))`

(c) `l_1=l_2((R)/(R-r))`

(d) `l_1=l_2((R-r)/R)`

view solution
Q: 6.5[1]

The energy of photon of wavelength X is_____ .

[h = Planck’s constant, c = speed of light in vacuum]

(a)hcλ

(b)hλ/c

(c)λ/hc

(d)hc/λ

 

view solution
Q: 6.6[1]

Which logic gate corresponds to the truth table given below?

A

B

Y

0

0

I

0

1

0

1

0

0

1

1

0

 

(a)  AND

(b)  NOR

(c)  OR  

(d) NAND

view solution
Q: 6.7[1]

The process of superimposing a low frequency signal on a high frequency wave is_______ .

(a) detection  

(b)  mixing

(c) modulation            

(d) attenuation

view solution
Q: 7 | Attempt any one of the following :[7]
Q: 7.1[7]

State the principle on  which transformer works.

view solution

Explain transformer working with construction.

view solution

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.

view solution

A conductor of any shape, having area 40 cm2 placed in air is uniformly charged with a charge 0* 2µC. Determine the electric intensity at a point just outside its surface. Also, find the mechanical force per unit area of the charged conductor.

[∈0=8.85x10-12 S.I. units]

view solution
Q: 7.2[7]

With the help of a neat labelled diagram, describe the Geiger- Marsden experiment

view solution

What is mass defect?

view solution

The photoelectric work function for a metal surface is 2.3 eV. If the light of wavelength 6800A is incident on the surface of metal, find threshold frequency and incident frequency. Will there be an emission of photoelectrons or not?

[Velocity of light c = 3 x 108 m/s,

Planck’s constant, h = 6.63 * 10-34 Js ]

view solution
Q: 8 | Attempt any three :[9]
Q: 8.1[3]

Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 1014 Hz, find the wave number of light in glass.

[Velocity of light in air (c = 3 x 108 m/s]

view solution
Q: 8.2[3]

In biprism experiment, 10th dark band is observed at 2.09 mm from the central bright point on the screen with red light of wavelength 6400 A. By how much will fringe width change if blue light of wavelength 4800A is used with the same setting?

view solution
Q: 8.3[3]

Describe Kelvin’s method to determine the resistance of galvanometer by using metre bridge.

view solution
Q: 8.4[3]

Explain the elementary idea of an oscillator with the help of block diagram

view solution
S