CLASS 11 PHYSICS PRE BOARD 2025 (Sample)
Max Marks: 80 Time: 3 hrs
1 MARKS QUESTION
(28 X 1 = 28)
1. How many significant figures does
0.005230 g/cm³ have? (a) 2 (b) 4 (c) 5
(d) 3
2. The time period of a pendulum on the
moon is:
(a) Zero
(b) Infinity (c) 2 seconds (d) None of these
3. What is the dimensional formula of
force? (a) ML²T⁻² (b) MLT⁻² (c) ML²T
(d) MLT⁻¹
4. How many micrometers are there in one
meter? (a) 10⁻⁶ (b) 10⁶ (c) 10³
(d) None of these
5. What is the magnitude of a unit vector?
(a) 1 (b) 0 (c) -1
(d) Undefined
6. How many joules are equivalent to 1
calorie? (a) 4.184 (b) 4.2 (c) 4.18
(d) None of these
7. What is the cross product of k x j? (a)
i (b) -i
(c) j (d) -j
8. Acceleration of an object can be: (a)
Positive (b) Negative (c) Zero
(d) All of these
9. What is the unit of Young's modulus? (a)
Nm (b) N/m (c) N/m²
(d) No unit
10. How many joules are equivalent to 1
kWh?
(a) 3600
(b) 36,000 (c) 3.6 × 10⁶ (d) 3.6 × 10³
11. Convert a velocity of 90 Km/hr into
m/s. (a) 25 m/s (b) 20 m/s (c) 30 m/s
(d) 15 m/s
12. The weight of a body on the moon is
approximately: (a) 1/2 its weight on Earth
(b) 1/6 its weight on Earth (c)
Equal to its weight on Earth (d) None of
these
13. What is the dimensional formula of
energy?
(a)
ML²T⁻² (b) MLT⁻² (c) ML⁻¹T⁻²
(d) None of these
14. What is the S.I unit of pressure? (a)
Pascal (b) Nm (c) N/m
(d) Torr
15. What is the orbital period of a
geostationary satellite?
(a) 24 hrs
(b) 12 hrs (c) 36 hrs (d) 48 hrs
16. What is the gravitational field
strength of a planet where the weight of a 70 kg astronaut is 490 N? (a) 5
N/kg (b) 7 N/kg (c) 10 N/kg
(d) 9.8 N/kg
17. What is one atmosphere of pressure?
(a) 101325 Pa (b) 100000 Pa
(c) 1.013 × 10⁵ Pa (d) None of
these
18. Represent the equation of an isothermal
process in terms of P and V. (a) PV = constant
(b) P/V = constant (c) PV² =
constant (d) None of these
19. The S.I unit of strain is: (a) No
unit (b) Pascal (c) N/m²
(d) None of these
20. If the amplitude of a wave is doubled,
its energy: (a) Remains same (b)
Doubles (c) Becomes four times (d) None of these
21. The number of degrees of freedom of a
diatomic gas molecule is: (a) 5 (b)
6 (c) 7
(d) 3
22. What is the value of Boltzmann
constant? (a) 1.38 × 10⁻²³ J/K (b) 1.38
× 10²³ J/K (c) 1.38 × 10⁻²² J/K (d) None of these
23. The distance between two successive
crests of a wave is called: (a) Wavelength
(b) Frequency (c) Amplitude (d) None of these
24. Sound waves are longitudinal waves. (a)
True (b) False
25. Force is a scalar quantity. (a)
True (b) False
26. The S.I unit of work is joule. (a)
True (b) False
27. Newton's second law is the fundamental
law of motion. (a) True (b) False
28. A vector can have a negative magnitude.
(a) True (b) False
2 Marks Question (2
x 7 = 14)
1. Distinguish between scalar and vector
quantities. Or Define the term 'moment of force'.
2. What is impulse? Give one real-life
example. Or Calculate the momentum of a 5 kg object moving at 10 m/s.
3. Define center of mass.
4. State and explain Pascal's law.
5. Define energy and give its units and
dimension.
6. What are the conditions for a process to
be reversible? Or A Carnot engine has an efficiency of 0.75 when operated
between a sink at 300 K. Calculate the temperature of the source.
7. How do sonar systems work? Or State
Boyle's law.
3 Marks Question
1. State and explain Newton's laws of
motion. Why is the first law also called the law of inertia?
2. Define gravitational potential energy.
Derive its expression for a mass m at a height h.
3. Derive the expression for the kinetic
energy of an object.
4. What is a wave? Derive the relation
between wave speed, frequency, and wavelength.
5. Explain why Cp is always greater than Cv
for an ideal gas.
6. Define elasticity and explain the
difference between stress and strain.
5 Marks Question
1. State and prove the work-energy theorem.
OR Derive the equation for motion under uniform circular motion.
2. Discuss the elastic and inelastic
collisions in detail. Provide examples. OR Derive the relation between escape
velocity and orbital velocity of a satellite.