VIDHYASHRI COACHING CLASSES

1/12/2021 Question Paper

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SEAT NO:

VIDHYASHRI COACHING CLASSES10 (Semi English)

(Prof.Pramod sir)

Science And Technology - I-

DATE: 12-01-21

TIME: 1:00

MARKS: 50

Q.1 Multiple Choice Questions 4

1 Using second law at of Kepler’s planetary motion, what is true for given diagram:

a. Area ASB = Area PSR. b. V = Vc. t = t d. V t = V t = (ASB + PSR)

2 If the distance between the two objects is doubled, the force between them- a. increase by factor 4 b. doubles c. decrease by factor 4 d. become hay

3 The force of gravitation increases as - a. mass of object increases b. the distance increases c. mass of the object is halved d. squaring the distance

4 CGS unit of Gravitational constant is ..............a. dyne cm g s b. dyne cm g c. dyne m kg- d. dyne cm kg-

Q.2 Find the odd one out 1

1 Weight, Centripetal force, Potential energy, Acceleration due to gravity

Q.3 Find co-related terms 1

1 Initial velocity during free fall : 0 m/s : acceleration during free fall : ……………

Q.4 Match the pair 2

1 I II III

i. Acceleration due to gravity m/s Zero at the centre

ii. Gravitational constant Kg Measure of inertia

Nm /Kg Same in entire universe

N Depends on height

2 I II III

i. Uniform motion N Beyond gravitational limit

ii. Escape velocity a=0 m/s Radial towards centre

Joule Increases with height

m/s Object at rest

Q.5 State True or False 2

1 2

1 2 1 2 2 1

2 -1 -1 2 -2 2 2 2 2

2

2 2

2



1 Newton gave the three laws of planetary motion.

2 The orbit in which Earth revolves around Sun is perfectly circular.

Q.6 Name the following 2

1 Give formula for gravitational potential energy at height h from the surface of earth.

2 If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?

Q.7 Give scientific reasons 4

1 True free fall is possible only in vacuum.

2 The centre of mass of any object having uniform density is at its centroid.

Q.8 Solve Numerical problems. 4

1 The radius of planet A is half the radius of planet B. If mass of A is M , what must be mass of B so thatvalue of g on B is half that of its value on A?

2 The mass and weight of an object on earth are 5 kg and 49N respectively. what will be their values onthe moon? Assume that acceleration due to gravity on the moon is 1/6 of that on the earth.

Q.9 Write Short Notes 4

1 Write short note on given figure.

2 Write short note on Earth’s gravitational acceleration

Q.10 Laws/define/principles 2

1 Define the following: 1. Acceleration due to gravity 2. Free fall

Q.11 Complete the given flow chart / table / diagram 2

1 Scientists Discovery

Sir Issac Newton ...............

............... Free Fall experiment

Johannes Kepler ...............

............... Value of 'G'

Q.12 Distinguish between 2

1 Mass and Weight

Q.13 Give examples 2

1 Give examples of Electromagnetic waves.

Q.14 Give explanation using the given statements 3

1 Read the statements given below. Identify and write the concept upon which the given statement is

A

th



based.

i. Gravitational force is a universal force.ii. The force which acts on planet and is responsible for its circular motioniii. The earth attracts every object near it towards itself which is the force.iv. Shashi drops a feather and a heavy stone at the same time from a height, they reach the earth at the

same time. Where is this experiment performed.v. Rashi throws an object vertically upward, the object comes to rest and stays there, what is the

distance of object from earth.vi. In f =

Gm1m

2

d2

, the value of which variable is 6.673 × 10 NM kg

Q.15 Complete the table / chart. 3

1 Complete the table :

Terms Units of Measurement

Universal gravitational constant ..................

Weight ..................

.................. Kg

Velocity ..................

Acceleration due to gravity ..................

.................. s

Q.16 Solve Numerical problems 3

1 The masses of earth and moon are 6 × 10 kg and 7.4 × 10 kg respectively. The distance betweenthem is 3.84 × 10 km. Calculate gravitational force of attraction between the two? (G = 6.7 × 10 NMkg ).

Q.17 Write laws, theories and explain. 3

1 The value of 'g' changes with the height ? Explain ?

Q.18 Complete the paragraph. 3

1 Complete the paragraph: (centroid , uniform, circular, mass, spherical , assumed , fixed, point) The centre of mass of an object is the ............... inside or outside the object at which the total ...............of the object can be .............. to be concentrated. The centre of mass of a .............. object having............... density is at its geometrical centre. The centre of mass of any object having uniform density isat its ................ .

Q.19 Write answers based on given diagram/figure 3

1 Answer the following based on figures.

Questions : i. What is observed in the given figure and who formulated it?ii. What is the first law of planetary motion ?

-11 2 -2

24 22

5 -11 2

-2



iii.Applying second law of planetary motion, what can we say about the motion of the planet ?

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