Municipality Examination
Physics - Grade XI
Examination - 2079 (2022)
Regular Students
Time - 3 hrs
Full Marks - 75
Pass Marks - 27
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
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Group "A"
Attempts all questions.
Write the correct option in your answer sheet. [11x1=11]
1. The dimensional formula for the time rate of change of impulse is the same as that for
a) Force
b) Impulse
c) Power
d) Energy
2. Two forces, one of 10 N and the other 6 N act upon a body. The directions of the forces are unknown, and the resultant force on the body is
a) Between 4 N and 16 N
b) More than 6 N
c) More than 10 N
d) Between 6 N and 16 N
3. A student runs along a straight line for the first half time with speed v1 and the second half with speed v2. Then the mean speed of the student is given by
a)v1+v2/2
b) 2v1v2/ v1+v2
c) v1v2/ v1+v2
d)√v1v2
4. An athlete makes a long jump and follows a projectile motion. Air resistance is negligible.
Which one of the following statements is true about the athlete?
a) The athlete has a constant horizontal velocity and constant downward acceleration.
b)The athlete has a constant downward acceleration followed by constant downward velocity.
c) The athlete has a constant upward velocity followed by a constant downward velocity.
d) The athlete has constant horizontal and vertical velocities.
5. If the radius of the earth suddenly decreases to 90% of its present value, the mass of the earth remains the same, and the value of acceleration due to gravity will
a) Remain unchanged
b) Decrease about 10%
c) Increases about 19%
d) Increases about 23%
6. Quark combination of the neutron is
a) Uss
b) uud
c) udd
d) dds
7. On charging a body negatively, it's mass
a) Gets increases
b) Gets decreases
c) May increase or decrease
d) Remains unchanged
8. A boy walks towards a stationary plane mirror at a speed of1.2 m/s. What is the relative speed of approach of the boy and his image?
a) Zero
b) 1.2 m/s
c) 2.4 m/s
d) 1.44 m/s
9. For shaving and make-up, concave mirrors are preferred because
a) They produce a real image.
b)They produce a virtual and magnified image when the object is placed between focus and radius of curvature.
c) They produce a virtual magnified image when the object is placed between pole and focus.
d) They produce the magnified image for all positions of the object.
10. The focal length of a convex lens is 20 cm. Its power is
a) +20 D
b) +5 D
c) -20 D
d) + 1/5 D
11. The figures represent three cases of a ray passing through a prism of refractive edge A. The case corresponding to minimum deviation is:
a)1
b) 2
c) 3
d.) All 1, 2, and 3
Group "B"
1. a. Why does cricket lower his hand while catching the ball? [2]
b. State and prove the principle of conservation of linear momentum by using Newton's third law of motion. [3]
2. Juno is a NASA orbiter with a mission to survey Jupiter. It is in an elliptical orbit around Jupiter as shown in the figure. (The gravitational potential at point A in the orbit of Juno is -1.70 x 109Jkg-1. )
a. State what is meant by the gravitational potential at point A is -1.70 x 109 kg-1. [2]
b. At point B, Juno is 1.69 x 108m from the center of Jupiter. If the mass of Jupiter is 1.9x 1027 kg. Calculate gravitationally potential at point B. [3]
3. a. What is meant by the latent heat of fusion of ice is 0.336MJ/kg [1]
b. Find the result of mixing 20 gm of water at 80 oC with 40 gm of ice at -10 o C. (Specific heat capacity of ice = 0.5Cal/gm oC) [3]
c. When a solid melt or a liquid boil, the temperature does not increase even when heat is supplied. Where does the energy go" [1]
4. a. Define coefficient of cubical expansion. [2]
b. How does density vary with temperature? Explain and derive the relation. [3]
5. a. Define lateral shift [1]
b. What will be the lateral shift when the angle of incidence is 90o. [1]
c. Two non-miscible transparent liquids of the refractive index of 1.5 and 3 are arranged as shown in the figure. What will be the apparent shift of mark M from the bottom? [ 3]
OR
a. Define the power of a lens. [1]
b. The refracting angle of the prism is 62o and the refractive index of the glass of yellow light is 1.65. What is the possible angle of incidence of a ray of this yellow light which is transmitted without total internal reflection [4]
6. a. Define resistance and resistivity.
b. An electron of charge 1.6 x 10-19 C is situated in a uniform electric field of intensity 12000 V/m Find the time it takes to travel 1 cm from rest. (me=9.1 x 10-31 kg ). [2+3]
7. a. Define 1-ampere current.
b. Define drift velocity. Derive an expression for the relation between drift velocity and current [1+4]
8. a. An electric line of force is a continuous curve i.e., a line of force can't have sudden breaks; why not? [2]
b. What is a capacitor? Find an expression for the energy stored in a charged capacitor. [3]
Group "C"
1. a. Define Projectile motion with example. [1]
b. A projectile is projected from the ground. Calculate the horizontal range of the projectile and show that its path is a parabola. [3]
c. Pochinki, a city on the Eranel map in PUBG, is one of the deadiest places to drop. A PUBG player wants maximum loot and aims to have a drop at Pochinki released from a plane flying horizontally at a constant velocity of 40m/s. if the plane is flying at a height of 180m from the ground,
i. What is the time of flight for the player to reach Pochinki.[2]
ii. How far from the city of Pochinki the player needs to drop horizontally. [2]
2. a. Define the terms stress and strain. [2]
b. Derive the expression for energy stored in a stretched wire. [3]
c. . The rubber cord of a catapult has a cross-sectional area of 1mmkalu and a total unscratched length of 10cm. It is stretched to 12cm and released to project a missile of mass of 5 gm. Calculate the velocity of the projection. [3]
[Young's modulus of rubber = 5 x 108 Nm-2]
3. a. it is said that the universe is expanding. What is your opinion? Give a suitable example. [2]
b. The nuclear density of 1 H1 and 92U235 are same. Comment it. [2]
c. If the energy liberated by a single atom of 92U235 in fission is 200MeV, calculate the power if 2g of is used per day. [4]
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