# HBSE Class 11 Physics SAT-1 Question Paper 2024 Answer Key

Haryana Board (HBSE) Class 11 Physics SAT-1 Question Paper 2024 PDF Download. SAT (Students Assessment Test). HBSE Class 11 Physics SAT Question Paper 2024. Haryana Board Class 11 Physics Students Assessment Test 2024. HBSE Class 11th Physics SAT 2024 Answer. Haryana Board Class 11 Students Assessment Test. Haryana Board Class 11 Physics SAT Paper 2024 Solution. हरियाणा बोर्ड कक्षा 11 भौतिक विज्ञान SAT पेपर 2024.

HBSE Class 11 Physics SAT-1 Question Paper 2024 Answer Key

Instructions :
• All questions are compulsory.
• Questions (1-9) carry 1 mark each.
• Questions (10-12) carry 2 marks each.
• Questions (13-14) carry 3 marks each.
• Question (15) case study, carry 4 marks.
• Questions (16-17) carry 5 marks each.

1. The number of Fundamental Quantities is :
(a) 7
(b) 14
(c) 3
(d) 5
Answer – (a) 7

2. Dimensional formula for the force is :
(a) MLT
(b) MLT–2
(c) MLT3
(d) None of these
Answer – (b) MLT–2

3. Swimming is an example of :
(a) 1st law of motion
(b) 2nd law of motion
(c) 3rd law of motion
(d) None of these
Answer – (c) 3rd law of motion

4. The energy possessed by the body by virtue of its motion is known as?
(a) Chemical energy
(b) Thermal energy
(c) Potential energy
(d) Kinetic energy
Answer – (d) Kinetic energy

5. A particle completes a circular path of radius r then displacement of particle will be …………
Answer – zero

6. Commercial unit of power is ………….
Answer – kW (kilowatt)

7. In an adiabatic process, what will be constant?
Answer – Heat

8. When the system is in equilibrium, then the resultant force acting on a body will be?
Answer – Zero

9. Assertion (A) : Work and heat are two equivalent forms of energy.
Reason (R) : Work is the transfer of mechanical energy irrespective of temperature difference, whereas heat is the transfer of thermal energy because of temperature difference only.
Answer – Both (A) and (R) are true and (R) is the correct explanation of (A).

10. Write the position-time equation for the uniformly accelerated motion.
Answer : s = ut + ½at2

11. Which law of motion is the real law of motion.
Answer – Newton’s 2nd law of motion

12. Write all Fundamental Quantities.
Answer – Length, Mass, Time, Electric current, Temperature, Amount of substance, Luminous intensity.

13. What are the fundamental and derived units?
Answer – The base unit of the measurements are known as the fundamental units. e.g. metre, kilogram etc.
The units expressed in terms of the fundamental units are known as the derived units. e.g. force, weight etc.

14. The displacement x of a particle is given by x = a + bt + ct2, where t is time in second and displacement x is in metres. Find the dimension of a and b.
Answer – By principle of homogeneity,
a = x = [L]
bt = x = [L]
b = x/t = [LT–1]

15. If an object moving along the straight line covers equal distances in equal intervals of time, it is said to be in uniform motion along a straight line. Distance and displacement are two quantities that seem to mean the same but are different with different meanings and definitions. Distance is the measure of actual path length travelled by an object. It is a scalar quantity having SI unit of metre while displacement refers to the shortest distance between initial and final position of an object. It is a vector quantity. The magnitude of the displacement for a course of motion may be zero but the corresponding path length is not zero.
Questions :
(i) Can the path length be zero for motion of the body from one point to other point?
Answer – No

(ii) For rectilinear motion displacement can be :
(a) Positive only
(b) Negative only
(c) Can be zero
(d) All of the above
Answer – (d) All of the above

(iii) SI unit of distance is :
(a) kilometre
(b) metre
(c) centimetre
(d) None of these
Answer – (b) metre

(iv) Displacement is a :
(a) scalar quantity
(b) vector quantity
(c) both scalar & vector quantity
(d) none of these
Answer – (b) vector quantity

16. A stone tied at the end of string is whirled in a circle. If the string breaks, the stone flies away tangentially. Why?
Answer – When a stone, that is tied at the endpoint of a string, moving around a circular path, its velocity acts tangent to the circle.
When the string breaks, the centripetal force will not act. Because of inertia, the stone continues to move along the tangent to the circular path and flies off tangentially to the circular path.

OR

Define time of flight and horizontal range.
Answer : Time of flight – The time taken by the projectile to complete its trajectory is defined as time of flight.
• Horizontal range – The maximum horizontal distance covered by the projectile from the foot of the tower to the point where the projectile hits the ground is defined as horizontal range.

17. State law of triangle vector addition.
Answer – Triangle law of vector addition states that if two vectors are represented in magnitude and direction by two sides of a triangle taken in the same order, then their resultant is represented by the third side of the triangle taken in the opposite order.

OR

Derive: s = ut + ½at2
Answer – Let the initial velocity of a body is u and the final velocity of the body is v.
The average velocity of the body = (u+v)/2
Distance travelled = Average velocity x Time
s = (u+v)/2 × t ………..(i)
Using the first equation of motion we can write,
v = u + at ……….. (ii)
From eqn.(i) and (ii),
s = (u+u+at)/2 × t
s = (2u+at)/2 × t
s = ut + ½at2

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