Gujrawala Board 2012
Phyusics
(Objective)
Inter (Part-I)
Time: 20 Minutes
Marks: 17

Note: You have four choices for each objective type question as A;B,C and D. the choice which you think is correct, fill that circle in front of that question number with marker or pen on the answer book provided. Cutting or filling two or more circles will result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave other blank.

• Which expression is correct for the time period of a simple pendulum?

(a)                                                      
(b)
(c)                                                 
(d)

• Which electromagnetic waves are used for satellite communication

(a) radio waves
(b) infrared waves
(c) γ-rays
(d) microwaves

• kWm^-2 is the unit of

(a) power
(b) intensity
(c) Emery
(d) energy per unit

• Which is a correct recorded for the diameter of wire when measured by a screw guage of least count 0.001 cm?

(a) 2.3cm
(b) 2.31 cm
(c) 2.312 cm
(d) 2.3124 cm

• Which is called internal energy of an ideal gas?

(a) potential energy
(b) translational kinetic energy
(c) vibrational kinetic energy
(d) rotational kinetic energy

• The minimum distance from the eye at which an object appears to be distinct is :

(a) 15cm
(b) 20cm
(c) 25cm
(d) 30 cm

• Which characteristics of light is evident from polarization of light?

(a) waves nature
(b) particle nature
(c) dual nature
(d) light waves are transverse

• The louder the sound, the greater will be its:

(a) amplitude
(b) wavelength
(c) speed
(d) frequency

• The direction of angular momentum of abody moving in circle is:

(a) along the tangent
(b) perpendicular to the plane of the circle
(c) radially outward
(d) radially inward

• A single vector having the same effect as all the original vectors taen together, is called:

(a) resultant vector
(b) equal vector
(c) position vector
(d) unit vector

• The SI unit of solid angle is

(a) degree
(b) sterdian
(c) revolution
(d) radian

• The most important factor regarding the significance of the cannot engine is that

(a) It is practically possible
(b) its efficiency is 100%
(c) its efficiency is possible maximum
(d) its efficiency is minimum

• Which combination can ensure less diffraction and more details to be seen by compound microscope?

(a) a wider objective and red light
(b) a wider objective and blue light
(c) a wider eyepiece and red light
(d) a wider eyepiece and blue light

• Two waves of equal frequency travelling in opposite direction produce

(a) interference
(b) stationary waves
(c) beats
(d) doppler effect

• The venture meter is used to find

(a) speed of the fluid
(b) density of the fluid
(c) pressure of the fluid
(d) viscosity of the fluid

• The area under the curve of force-displacement graph represent

(a) force
(b) displacement
(c) work
(d) power

• The vector  has the and . The magnitude  is given by :
  (a) A - A_y                                               
  (b)
  (c)                                        
  (d)

Gujrawala Board 2012
Physics
Inter (Part-I)
Time: 2:40 Hours
Marks: 68

(Section-I)

2. Write short answers to any EIGHT questions: (2×8=16)

• Give drawbacks to use the period of a pendulum as a time standard.
• Differentiate between random error and systematic error.
• The period of a simple pendulum is measured by a stop watch. What type of errors are possible in the time period?
• Under what circumstances would a vector have components that are equal in magnitude?
• Two vectors have unequal magnitude. Can their sum be zero? Explain
• Differentiate between static and dynamic equilibrium .
• Show that the rate of change of momentum is equal to force.
• An object is thrown vertically upward. Discuss the sign of acceleration due to gravity relative to velocity while the object is in air.
• Explain the circumstances in which the velocity v and acceleration of a car are (a) Anti-parallel (b) perpedivular to one another
• A girl drops a cup from a certain height, which breaks into pieces. What energy changes are involved?
• When a rocket re-enters the atmosphere. Its nose cone becomes very hot. Where does this heat energy come from?
• Define kilowatt hour(kWh). Show that 1 kWh = 3.6×10⁶J

3. Write short answers to any EIGHT questions: (2×8=16)

• State the law of conservation of angular momentum.
• What is meant by moment of inertia? Explain significance
• State the direction of the following vectors in simple situations (i) Angular momentum (ii) angular velocity
• State Torricell’s Theorm
• How swing is produced in a fast moving cricket ball? Explain
• A person is standing near a fast moving train . is there any danger that he will fall towards it?
• What is simple pendulum?
• Describe two common phenomena in which resonance plays an important role.
• Name two characteristics og S.H.M
• What are beats?
• Explain the terms Crest and Trough
• A wave is produced along a starched string but some of its particles permanently show zero displacement. What type of wave is it?

4. Write short answers to any EIGHT questions: (2×8=16)

• What is diffraction of light?
• How would you manage to get more orders of spectra using a diffraction grating?
• Why the Polaroid sunglasses are better than ordinary sunglasses?
• Define total internal reflection
• Why would it be advantageous to use blue with a compound microscope?
• One can buy a cheap microscope for use by the children. The images seen in such a microscope have coloured edges. Why is this so ?
• Derive Charles’ law from kinetic theory of gases.
• Give an example of a natural process that involves an increase in entropy.
• Specific heat of a gas at constant pressure is greater than specific heat at constant

Section (II)

5(a). Define and explain the term ‘Torque’ Discuss torque in case of rigid body
(b). A 100 gm golf ball is moving towards right with a velocity of 20m/sec. it makes a head on collision with a 8 kg steel ball, initially at rest. Compare velocities of the ball after collision

6.(a) Define gravitational field. Show that work done in the Earth’s gravitational field is independent of the path followed.
(b). What is the least speed at which an aeroplane can execute a vertical loop of 1.0 km radius so that there will be no tendency for the pilot to fall down at the highest point?

7.(a) Derive Bernoulli’s equation for the laminar flow of fluids.
(b). The turbine’ in a steam power plant takes steam from a boiler at 427°C and exhausts into a low temperature reservoir at 77°C. what is the maximum possible efficiency?

8.(a) What is simple harmonic motion? show that the total energy of the vibrating mass spring system is constant.
(b). The frequency of the note emitted by a stretched string is 300 Hz. What will be the frequency of this note, when the length of the wire is reduced by one-third without changing the tension?

9.(a) Discuss diffraction of X-rays by crystals.
(b). An astronomical telescope having magnifying power of 5 consists of two lenses 24 cm apart. Find the focal lengths of the lenses.