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Revision Course : Sainik School Exam Syllabus (Topic Wise GK)Shape of Earth and Gravitation MCQs. Sainik School Coaching Jalandhar
Topic : Shape of Earth and Gravitation.
Shape of Earth and Gravitation. Sainik School Coaching Jalandhar
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Q.1> What is the name of attractive force which act between any two bodies in our universe?
A: Gravitational force
B: Coulomb attractive force
C: Nuclear force
D: Magnetic force
Answer
Gravitational force
Q.2> What is the value of Universal Gravitational Constant (G) in C.G.S unit?
A: 6.67 * 10-6 cgs unit
B: 6.67 * 10-7 cgs unit
C: 6.67 * 10-8 cgs unit
D: 6.67 * 10-10 cgs unit
Answer
6.67 * 10-8 cgs unit
Q.3> What is the unit of Universal Gravitational Constant in SI unit?
A: N-m-Kg
B: N/m-Kg
C: N-m/Kg2
D: N/m2-Kg
Answer
N-m/Kg2
Q.4> What is the value of gravitational acceleration on Earth?
A: 9.8 m-s2
B: 9.8 m/s2
C: 8.9 m-s2
D: 8.9 m/s2
Answer
9.8 m/s2
Q.5> The value of gravitational acceleration is –
A: increases as height increase form the earth.
B: decreases as height increase from the earth.
C: remains constant
D: None of the above
Answer
Increases as height increase from the earth
Q.6> Where the value of gravitational acceleration is less due to the diurnal motion of earth?
A: At Polar region
B: At equator
C: Tropic of Cancer or Tropic of Capricorn
D: None of this
Answer
At equator
Q.7> In which region of earth the weight of a body is slightly greater?
A: At Polar region
B: At equator
C: Tropic of Cancer or Tropic of Capricorn
D: None of this
Answer
At polar region
Q.8> If speed of rotation of earth increases then what would be the value of weight of a body?
A: Weight of a body will increases
B: Weight of a body will decreases
C: Weight of a body remain constant
D: Can not be answered
Answer
Weight of a body will decreases
Q.9> What is the approximate mass of Sun?
A: 2 * 1034 kg
B: 2 * 1032 kg
C: 2 * 1030 kg
D: 2 * 1028 kg
Answer
2 * 1030 kg
Q.10 What is the approximate mass of earth?
A: 3 * 1024 kg
B: 4* 1024 kg
C: 5* 1024 kg
D: 6 * 1024 kg
Answer
6 * 1024 kg
Q.11 What is escape velocity?
A: Velocity of moon
B: Velocity of earth
C: Velocity of a body that allow it to go outside the earth
D: Tangential velocity of equator.
Answer
Velocity of a body that allow it to go outside the earth.
Q.12 What is the value of escape velocity of earth?
A: 9.8 km/sec
B: 10 km/sec
C: 11.2 km/sec
D: 12 km/sec
Answer
11.2 km/sec
Q.13 Does time period of artificial satellite depend on its mass?
A: Yes
B: No
Answer
No
Q.14 What would be the height of an artificial satellite so that it can be observed at same position with respect to earth?
A: 36000 km above the earth surface
B: 40000 km above the earth surface
C: 26000 km above the earth surface
D: 63000 km above the earth surface
Answer
36000 km above the earth surface.
Q.15 How much time a polar satellite take to complete one revolution around earth?
A: 1 hour 30 min.
B: 2 hours
C: 2 hour 20 min
D: 3 hour
Answer
2 hours
Q.16 What is the weight of a body inside an artificial satellite of earth?
A: It depends on the mass of the body
B: It depends on the velocity of satellite
C: Product of its mass and gravitational acceleration
D: Zero
Answer
Zero
Q.17 Does the gravitational force same for two objects inside and outside the water?
A: Yes
B: No
Answer
Yes
Q.18 What is the weight of a body of mass 1 kg?
A: 1 kg
B: 9.8 kg
C: 9.8 Kg-m/Sec2
D: 9.8 N
Answer
Both C and D; [(Kg-m/Sec2 ) = N]
Q.19 Weight of free fall object is
A: mass of the object × gravitational acceleration
B: Zero
C: greater than rest object
D: less than rest object
Answer
Zero
Q.20 Does escape velocity of a body depend on its mass?
A: Yes
B: No
Answer
No
Q.21 Let the escape velocity of earth is Ve. What would be the escape velocity of a planet whose mass and radius is double from earth?
A: Ve
B: 2 Ve
C: 4 Ve
D: 16 Ve
Answer
Ve ; escape velocity = √(2GM/R)
Note : G= universal gravitational constant; M = mass of planet; R = Radius of planetQ.22 If the radius of earth is decrease keeping mass constant, then the length of day will
A: decrease
B: Increase
C: remain same Shape of Earth and Gravitation
D: can not say
Answer
Decrease
Q.23 If the earth stop rotating then the weight of an object on north pole will
A: Increase
B: decrease
C: remain same Shape of Earth and Gravitation
D: be zero
Answer Sainik School Study Material
Remain same
Q.24 If a stone bring back to earth from moon then its
A: mass will be changed
B: mass and weight will be changed. Online Sainik School Coaching
C: Weight never be changed
D: mass remain constant but weight will be changed
Answer
Mass remain same but weight will be changed.
Q.25 Suppose an object is thrown upward with an angle θ providing velocity equal to escape velocity (Ve). The magnitude of escape velocity will be..
A: Ve
B: Ve Cosθ
C: Ve Sinθ
D: Ve tanθ
Answer
Ve
Q.26 While revolving an artificial satellite around earth, the required centripetal force is provided by –
A: fuel contained in the satellite RIMC RMS Coaching Jalandhar
B: gravitational force due to sun
C: gravitational force due to earth RIMC RMS Coaching Jalandhar
D: Thrust produced by burning fuel Sainik School Study Material
Answer
gravitational force due to earth.
Q.27 In case of planet’s motion –
A: velocity remain constant in its orbit.RIMC RMS Coaching Jalandhar
B: angular velocity remain constant
C: total angular momentum remain constant
D: radius of orbit remain constant.
Answer
Total angular velocity remain constant. Online Sainik School Coaching
Q.28 An artificial satellite revolving around earth in a circular orbit. Its
A: linear velocity is constant
B: acceleration is constant
C: acceleration is changing RIMC RMS Coaching Jalandhar
D: angular velocity constant
Answer
acceleration is changing. RIMC RMS Coaching Jalandhar
Q.29 What is the value of gravitational acceleration inside the earth?
A: 9.8 m-s2
B: Infinite Sainik School Study Material
C: Zero
D: Can not be calculated Sainik School Study Material
Answer
Zero Online Sainik School Coaching
Q.30 In case of free fall the gravitational acceleration on a spherical object depends on__
A: The mass of the object Online Sainik School Coaching
B: The radius of the object
C: The density of the object
D: None of the above
Answer
None of the above
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