Q 1 – Two objects of different masses falling freely near the surface of the moon would
(a) have same velocities at any instant
(b) have different acceleration
(c) experience forces of the same magnitude
(d) undergo a change in their inertia
(a) have same velocities at any instant
Q 2 –For a given applied thrust, the pressure exerted on a surface by a sharp pin is
(a) more than the pressure exerted by a blunt pin.
(b) less than the pressure exerted by a blunt pin.
(c) equal to the pressure exerted by a blunt pin.
(d) either less or equal to the pressure exerted by a blunt pin.
(a) more than the pressure exerted by a blunt pin.
Q 3 – The value of acceleration due to gravity
(a) is the same on the equator and poles
(b) is least on poles
(c) is least on the equator
(d) increases from pole to equator
(c) is least on equator
Q 4 – The gravitational force between two objects is F. If the masses of both objects are halved without changing the distance between them, then the gravitational force would become
(a)F/4
(b)F/2
(c) F
(d) 2F
(a) F/4
Q 5 – Two objects of different masses falling freely near the surface of the moon would
(a) have the same velocities at any instant
(b) have different acceleration
(c) experience forces of the same magnitude
(d) undergo a change in their inertia
(a) have same velocities at any instant
Q 6 – The walls of a dam at the bottom are made thick because
(a) it looks attractive
(b) it is conventional
(c) it is convenient
(d) water exerts large pressure at the bottom
(d) water exerts large pressure at the bottom
Q 7 – Freely falling objects weight ._______.
(a) zero
(b) 1/4 time
(c) 1/2 time
(d) unchanged
(a) zero
Q 8 – An object is put one by one in three liquids having different densities. The object floats with 1/9 ,2/11 and 3/7 parts of their volumes outside the liquid surface in liquids of densities d1, d2 and d3respectively. Which of the following statement is correct?
(a) d1 > d2 > d3
(b) d1 > d2 < d3
(c) d1 < d2 > d3
(d) d1 < d2 < d3
(d) d1 < d2 < d3
Q 9 – The weight of an object is least at some region of the earth. What will be the colour of bears found in that region?
(a) black
(b) white
(c) blue
(d) brown
(b) white
Q 10 – In the relation F = GM mld2, the quantity G
(a) depends on the value of at the place of observation
(b) is used only when the Earth is one of the two masses
(c) is greatest at the surface of the Earth
(d) is the universal constant of nature
(d) is the universal constant of nature
Q 11 – Law of gravitation gives the gravitational force between
(a) the Earth and a point mass only
(b) the Earth and Sun only
(c) any two bodies having some mass
(d) two charged bodies only
(c) any two bodies having some mass
Q 12 – The value of quantity G in the law of gravitation
(a) depends on the mass of Earth only
(b) depends on the radius of Earth only
(c) depends on both the mass and radius of Earth
(d) is independent of the mass and radius of the Earth
(d) is independent of the mass and radius of the Earth
Q 13 – Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be
(a) 1/4
(b) 4 times
(c) 1/2
(d) unchanged
(b) 4 times
Q 14 – The atmosphere is held to the Earth by
(a) gravity
(b) wind
(c) clouds
(d) Earth’s magnetic field
(a) gravity
Q 15 – The force of attraction between two unit point masses separated by a unit distance is called
(a) gravitational potential
(b) acceleration due to gravity
(c) gravitational field
(d) universal gravitational constant
(d) universal gravitational constant
Q 16 – The weight of an object at the center of the Earth of radius R is
(a) zero
(b) infinite
(c) R times the weight at the surface of the Earth
(d) 1/R2 times the weight at surface of the Earth
(a) zero
Q 17 – An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be
(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
(a) 2 N
Q 18 – A girl stands on a box having 60 cm length, 40 cm breadth, and 20 cm width in three ways. In which of the following cases, the pressure exerted by the box will be
(a) maximum when length and breadth form the base
(b) maximum when breadth and width form the base
(c) maximum when width and length form the base
(d) the same in all the above three cases
(b) maximum when breadth and width form the base
Q 19 – A rectangular block of wood of dimensions 40cm x 20cm x 10cm is kept on a tabletop. The pressure is greatest when it is
rested on
(a) equal for all cases
(b) 20 cm x 10 cm
(c) 40 cm x 10cm
(d) 40 cm x 20cm
(b) 20 cm x 10 cm
Q 20 – An apple falls from a tree because of gravitational attraction between the Earth and the apple. If F1 is the magnitude of the force exerted by the Earth on the apple and F2 is the magnitude of the force exerted by the apple on the Earth, then
(a) F1 is very much greater than F2
(b) F2 is very much greater than F1
(c) F1 is only a little greater than F2
(d) F1 and F1 are equal
(d) F1 and F1 are equal
Q 21 – The acceleration due to gravity on the Earth depends upon the
(a) mass of the body
(b) mass of the Earth
(c) shape and size of the body
(d) the volume of the body
(b) mass of the Earth
Q 23 – When a mango falls from a mango tree then
(a) only the Earth attracts the mango.
(b) only the mango attracts the Earth.
(c) both the mango and the Earth attract each other.
(d) both the mango and the Earth repel each other.
(c) both the mango and the Earth attract each other.
Q 24 – Acceleration due to gravity varies with
(a) height
(b) depth
(c) the shape of the planet
(d) all of these
(d) all of these
Q 25 – When a ship floats in sea water
(a) The weight of water displaced is greater than the weight of ship
(b) The weight of water displaced is less than the weight of the ship
(c) The weight of water displaced is equal to the weight of the ship
(d) It displaces no water.
(c) The weight of water displaced is equal to the weight of the ship
Q 26 – The SI unit of pressure is
(a) Nm2
(b) N/m
(c) N/m2
(d) N2/m2
(c) N/m2
Q 27 – If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
(a) The weight of the body will become zero but the mass will remain the same.
(b) The weight of a body will remain the same but the mass will become zero.
(c) Both mass and weight become zero.
(d) Neither mass nor weight becomes zero.
(a) The weight of the body will become zero but the mass will remain the same.
Q 28 – Fill in the blanks
1. Gravitational force is always………….in nature.
2. ………….of a body is the quantity of matter contained in it.
3. SI unit of mass is …………….
4. Weight of an object is the force with which it is attracted toward the…………..
5. The acceleration due to the gravity of the moon is……………..of that of the Earth.
6. Every fluid exerts an…………….force on a body immersed in it. This force is called………………
7. Density of a substance is defined as mass per unit…………
8. The force acting on an object……………….to the surface is called thrust.
9. The relative density of a substance is the ratio of its density to that of……………..
- attractive
- Mass
- kilogram
- Earth
- one-sixth
- upward and buoyant
- volume.
- perpendicular
- water.
Q 29 – Match the following columns
| Column A | Column B |
| (a) SI unit of Weight | (i) Kilogram |
| (b) mass | (ii) F = Gm1m2/r2 |
| (c) Weight | (iii) mg |
| (d) Buoyant force | (iv) newton |
| (e) Relative density | (v) Ratio of the density of the substance to that of water |
| (f) SI unit of mass | (vi) Quantity of matter contained in a body |
| (g) Gravitational force between two bodies (expression) | (vii) Force acting on body due to Earth’s attraction |
| (viii) Weight of an object (expression) | (viii) Upward force on a body placed in a fluid |
Ans.
| Column A | Column B |
| (a) SI unit of Weight | (iv) newton |
| (b) mass | (vi) Quantity of matter contained in a body |
| (c) Weight | (vii) Force acting on body due to Earth’s attraction |
| (d) Buoyant force | (viii) Upward force on a body placed in a fluid |
| (e) Relative density | (v) Ratio of density of the substance to that of water |
| (f) SI unit of mass | (i) Kilogram |
| (g) Gravitational force between two bodies (expression) | (ii) F = Gm1m2/r2 |
| (viii) Weight of an object (expression) | (iii) mg |
Q 30 – The earth and the moon are attracted to each other by gravitational force. The earth attracts the moon with a force that is:
(a) More than that exerted by the moon
(b) Same as that exerted by the moon
(c) Less than that exerted by the moon
(d) Not related to that exerted by the moon
(b) Same as that exerted by the moon
Q 31 – An apple and a stone dropped from certain height accelerates
(a) equally
(b) differently
(c) depending on density
(d) depends on the position of the Sun
(a) equally
Q 32 – According to Archimedes’ principle when a body is submerged in a liquid, its apparent weight
(a) decreases
(b) increases
(c) remains unchanged
(d) may increase or decrease depending upon the material of the body
(a) decreases
Q 33 – If upthrust U is equal to 1/4 the weight of the object in the air, then the weight felt in the liquid is
(a) 1/4
(b) 3/4
(c) 1/2
(d) 2 W
(b) 3/4
Q 34 – A mass weighing W can float if the upthrust U is related as
(a) U > W
(b) U = W
(c) U < W
(d) U ≥ W
(a) U > W
Q 35 – The pressure exerted by man on earth is minimum when he
(a) sits
(b) stands on one foot
(c) stands on both feet
(d) lies on ground
(d) lies on ground
Q 36 – When a body floats in a liquid, its apparent weight is always
(a) less than the weight of the body
(b) more than the weight of the body
(c) equal to the weight of the body
(d) zero
(d) zero
Q 37 – Thrust exerted by an iron cuboid when placed on sand is equal to
(a) mass of cuboid
(b) mass per unit surface area
(c) weight of cuboid
(d) weight per unit surface area
(c) weight of cuboid
Q 38 – The gravitational force between two bodies does not depend on
(a) their separation
(b) their masses
(c) the product of their masses
(d) the medium between the two bodies
(d) the medium between the two bodies
Q 39 – Two objects of different masses falling freely near the surface of the moon would
(a) have same velocities of any instant
(b) have different accelerations
(c) experience forces of different magnitudes
(d) undergo a change in their inertia
(c) experience forces of different magnitudes
Q 40 – School bags have a broader base to reduce
(a) pressure
(b) weight
(c) air resistance
(d) normal reaction
(a) pressure
Q 41 – Weight of 1 kg is
(a) 9.8 newton
(b) 1 kg-wt
(c) both (a) and (b)
(d) either (a) or (b)
(a) 9.8 newton
Q 42 – When a body is weighed in a liquid, the loss in weight is equal to
(a) weight of the liquid displaced by the body
(b) weight of water displaced by the body
(c) weight of the body in the air
(d) half the weight of the body in the air
(a) weight of the liquid displaced by the body
Q 43 – The constant G
(a) is a very small quantity
(b) is a force
(c) is the same as g
(d) decrease with increasing altitude
(a) is a very small quantity
Q 44 – The mass of the body on the moon is 40kg, what is the weight on the earth.
(a) 240kg
(b) 392N
(c) 240N
(d) 400kg
(b) 392N
Q 45 – The relative density of a solid is 0.6. It floats in water with
(a) 40% of its volume inside water
(b) 60% of its volume inside water
(c) the whole of its volume inside water
(d) any fraction of its volume inside water
(b) 60% of its volume inside water
Q 46 – An empty closed drum and a filled drum of same dimension will bring
(a) same upthrust
(b) same volume
(c) both (a) and (b)
(d) neither (a) nor (b)
(c) both (a) and (b)
Q 47 – What is buoyant force-
(a) An upward force on an object immersed in a liquid
(b) Partially downward force
(c) A downward force on an object immersed in a liquid
(d) None of the above.
(a) An upward force on an object immersed in a liquid
Q 48 – Gravitation force is a
(a) short-range force
(b) non-central force
(c) weakest force
(d) strongest force
(c) weakest force
Q 49 – If the radius of earth were to shrink by 1%, its mass remaining the same, the acceleration due to gravity on earth’s surface would
(a) decrease
(b) increase
(c) remain unchanged
(d) can’t be calculated
(b) increase
Q 50 – A sharp edge blade is more effective in cutting than a blunt blade due to
(a) Low force
(b) Low pressure
(c) Large contact area
(d) Small contact area
(d) Small contact area