Question

SECTION -A (PHYSICS)
1. Read the following case study and answer the following questions carefully
Adarsh and Suresh are two athletes of class 9. During a practice session both were practicing
square ground of side 100 m with a speed of 4m/s and 9km/h respectively. After completing
half round both of them got tired and took a 30 min break and then again started the practic
1. Who is faster?
a. Adarsh b. Suresh
c. Both are same
d. Can't say
2. Difference in their speed is
a. 2.5m/s b. 1.5m/s
c.5m/s
d. Can't say
3.) Distance covered by them after three and half round
a. 400m
b. 800m
c. 4200m
d. None of these
4. Displacement after ten and half round
a. 100 V2 m
b. 400 m
c.200 V2 m
d. None of above
2. Read the following case study and answer the following questions carefully
All the cars these days are provided with seat belts for the passengers, which are rightly cal
belts. The purpose of the seat belts is to prevent injuries to the passengers in case of an acc
in case of sudden applications of brakes.
1) Safety belts used in cars are an application of Newton's
a) First law
b. Second law c. Third law d. Law of energy
2) The safety belts on sudden application of brakes the time interval in which the mo
13x100
100
x 17​

Answer 1

Answer:

Passage 1.

1. (b) Suresh
2. (c) 5 m/s
3. (d) None of the above
4. (a) $100\sqrt{2}$ m

Passage 2.

1. First Law

Explanation:

Passage 1.

1. Suresh is faster because his speed is 4 m/s whereas speed of Adarsh is 4 m/s.

2. Speed of Adarsh = 4 m/s and Speed of Suresh = 9 m/s

So, the difference between their speed = (9 - 4) m/s = 5 m/s.

3. Distance covered by them after three and a half rounds

= 3 × 400 + (1/2) × 400 = 1200 + 200 = 1400 m

4. Displacement after ten and a half rounds

= the length of the diagonal of the square field = $100\sqrt{2}$ m

Passage 2.

1) Safety belts used in cars are an application of Newton's First Law.

Newton's First law is the law of inertia which states that the body is in uniform motion or rest, and remains at rest or uniform motion until and unless an external force is applied.

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