Class 11 Physics
Sample Paper 5 | Class 11 Physics
Class- XI
Sample paper - 5
General Instructions:
- All questions are compulsory. There are 37 questions in all.
- This question paper has 4 sections: Section-A, Section-B, Section-C & Section-D.
- Section A contains 20 questions of one mark.
- Section-B contain 7 questions of 2 marks.
- Section-C contains 7 questions of 3 marks
- Section- D contains 3 questions of 5 marks each.
- There is no overall choice. However internal choices are provided. You have to attempt only one of the choices in such questions.
- Use of calculators is not permitted. However, you may use log tables if necessary.
The escape speed for an object from the surface of the Earth is:
(a) 11.2 km-s-1
(b) 25.8 km-s-1
(c) 15.6 km-s-1
(d) 76 km-s-1
Give formula for ‘Mean free path’.
“To every action, there is always an equal and opposite reaction”. This is the statement of:
(a) Newton’s 1st law of motion.
(b) Newton’s 2nd law of motion.
(c) Newton’s 3rd law of motion.
(d) None of the above.
How do you define the “average pressure” in case of a fluid?
- torr = __________ Pascal.
(a) 133
(b) 143
(c) 153
(d) 173
What Newton’s first law of motion states?
Question 7:
The amount of substance is called __________.
(a) gas
(b) Avogadro’s number
(c) a mole
(d) unified atomic mass
The SI unit of stress is:
(a) Pascal
(b) N-m2
(c) Both (a) and (b)
(d) joules
Question 9:
What is Hooke’s law?
OR
A cricket ball is thrown at a speed of 30 m/s in a direction 300 above the horizontal. Calculate the maximum height.
Give difference between uniform and non-uniform motions.
What is the relation between time period and frequency, if the object is in periodic motion?
Question 12:
Find the scalar and vector products of two vectors, a = 2
+ 
+ 3
and b = - + 2 + 5 .
OR
Find the torque of a force + 
+ 
about the origin. The force acts on a particle whose position vector is 3 + + 2 .
Question 13:
What is the temperature relation between two scales i.e. Farenheit and Celsius scales?
Define thermal expansion.
What are thermodynamics state variables?
Define isothermal process.
How many metres in 3 light years?
Fill in the blanks:
(a) 1 fermi = __________ m.
(b) 1 Parsec = __________ m.
Question 19:
How do you define the period of oscillation of the wave?
What are the units and dimensions for wave speed?
Question 21:
A body constrained to move along the z-axis of a coordinate system is subject to a constant force F is given by:
F = 2 + 3 + 4 N
where , and are unit vectors along x, y- and z-axis of the system respectively. What is the work done by this force in moving the body a distance of 3 m along the z-axis?
A string of mass 5.00 kg is under a tension of 350 N. The length of the stretched string is 20.0 m. If the transverse jerk is struck at one end of the string, how long does the disturbance take to reach the other end?
Question 23:
The period of oscillation of a simple pendulum is T=2∏√L/√g. Measured value of L is 25.0cm. known to 1mm. accuracy and time for 100 oscillations of the pendulum is found to be 80 sec. using a wrist watch of 1s resolution. What is the accuracy in the determination of g?
What does second law of thermodynamic state?
OR
Give units, symbols and dimensions for the following quantities:
(a) Co-efficient of volume expansion.
(b) Heat supplied to a system.
A utensil filled with hot food cools from 96 °C to 84 °C in 4 minutes when the room temperature is at 20 °C. How long will it take to cool from 65°C to 63°C?
What is theorem of parallel axes?
A spring balance has a scale that reads from 0 to 50 kg. The length of the scale is 15 cm. A body suspended from this balance, when displaced and released, oscillates with a period of 0.4 s. What is the weight of the body?
OR
Explain: “average velocity” and “average speed”.
SECTION - C
Question 28:
A spaceship is stationed on Mars. How much energy must be expended on the spaceship to launch it out of the solar system? Mass of the space ship = 1500 kg; mass of the sun = 2×1030 kg; mass of mars = 6.4×1023 kg; radius of mars = 3395 km; radius of the orbit of mars = 2.28 ×108 km; G = 6.67×10-11 N m2 kg–2.
A bob of mass 0.2 kg hung from the ceiling of a room by a string 4 m long is set into oscillation. The speed of the bob at its mean position is 1.5 m/s. What is the trajectory of the bob if the string is cut, when the bob is (a) at one of its extreme positions, and (b) at its mean position?
Explain:
(a) Bernoulli’s principle
(b) Gauge pressure
Formulize Hooke’s law according to the three types of stresses.
Question 32:
A stone tied to the end of a string 100 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 15 revolutions in 30s, what is the magnitude and direction of acceleration of the stone.
Differentiate between “path length” and “displacement”.
What is the force law for simple harmonic motion?
SECTION - D
A star 2.0 times the mass of the sun and collapsed to a size of 15 km rotates with a speed of 1.5 rev. per second. (Extremely compact stars of this kind are known as neutron stars. Certain stellar objects called pulsars belong to this category). Will an object placed on its equator remain stuck to its surface due to gravity? (Mass of the sun = 2×1030 kg).
OR
Explain:
(a) Kinetic energy of a rolling body.
(b) Moment of inertia of a rigid body.
Question 36:
A nitrogen container of volume 45 litres has an initial gauge pressure of 20 atm and a temperature of 30 °C. After some nitrogen is withdrawn from the container, the gauge pressure drops to 15 atm and its temperature drops to 15 °C. Estimate the mass of nitrogen taken out of the container (R = 8.31 J mol–1 K–1, molecular mass of N2 = 28 u).
Question 37:
Derive theorem of perpendicular axes.
OR
Define:
(a) Specific heat capacity of a substance.
(b) Molar specific heat of a substance.
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