A) Force
B) Linear momentum
C) Newton
D) Dyne
2) S. I unit of
A) momentum
B) Force
3) C. G. S of
A) force
4) Fill in the blanks:
A) 1 kgf = ___N
B) ___gf = 980 dynes
C) Force produces an acceleration on the____ direction as the force.
D) The S. I unit of momentum is___.
E) Force= Rate of change of ____.
F) One newton = _____ dyne.
G) momentum= mass x _____
H) One kgf= ____dyne
5) State True and False:
A) The momentum of a body depends on its mass and the velocity.
B) The momentum of a body is the product of the mass of the body and acceleration.
C) It is difficult to stop a tennis ball than a cricket ball moving with the same speed.
6) Very Short Answer Type Questions:
A) Is a force needed to keep a body moving with uniform velocity?
B) What is the relation between S. I and C. G. S. units of force?
C) Write an expression for the momentum of a body.
D) Is momentum a scalar or a vector quantity?
E) What is the relation between kilogramme force and newton?
F) Name the physical quantity whose unit is Newton.
G) On what factors does the momentum of a body depend ?
H) What name is given to the product of mass and velocity of a body ?
I) A force is applied on
i) a non-rigid object
ii) a rigid object.
How does the effect of the force differ in both cases ?
J) Derive a relation between S. I and C. G. S units of force.
7) Tick the correct answer:
A) A force:
a) cannot start or stop the motion of a body.
b) can change the speed or direction of motion or both of a moving body.
c) cannot bring a change in dimensions of a body.
d) none.
B) The S. I unit of momentum is:
a) dyne
b) Newton
c) kg ms⁻¹
d) cm s⁻²
8) The following reading were taken in an experiment with a density bottle:
• Weight of empty density bottle= 26.7 gf
• Weight of density bottle filled with copper sulphate solution=82.95 gf
• Weight of density bottle filled with water= 79.42 gf
Use the above readings to calculate the relative density (R. D) of the copper sulphate solution to 3 decimal places. State the density of the copper sulphate solution in g/cm³ and kg/m³.
9) The following reading were taken in an experiment to find the density of petrol, using a density bottle:
• Weight of empty density bottle= 34.6 gf
• Weight of density bottle filled with water = 54.6 gf
• Weight of density bottle filled with petrol = 50.6 gf
Use the above readings to calculate the relative density (R. D) of petrol in g/cm³ and kg/m³. State the relative density of petrol as obtained by this experiment.
10) A piece of glass weighs 50 gf in air, 30 gf when fully immersed in water, and 32.6 gf when fully immersed in turpentine. Calculate
A) the volume of the glass.
B) the density of the glass.
C) the density of the turpentine.
11) Explain why submarine are able to drive under water as well as sail on the surface of water.
12) What is the difference between the density and the relative density of an object?
13) A feather and a stone of the same mass fall at different rates in air. Which falls faster and why?
14) a) Define the term 'density of a substance'
b) State the S. I unit of density
c) What is the C. G. S unit of density.
d) How is the state above related to the S. I unit of density.
15) Complete the following sentences:
a) Mass= volume x ______
b) Density in kg/m³= _____ x density in g/cm³.
16) State whether True/False:
a) The density of all the substances increases with increase in temperature.
b) Mercury is lighter than water.
17) Give one example each, of a force that:
a) pushes
b) pulls
c) stretches
d) squeezes
18) Is force a scalar or a vector quantity?
19) State the effect of force in each of the following cases:
a) A spring is stretched by a load.
b) A small piece of silver sheet is hammered to make thin fouls.
c) A ball lying on the ground is kicked.
d) A fielder catches a cricket ball.
e) A cyclist applies more force on the pedal.
f) Brakes are applied to a moving vehicle.
g) A batsman hits a ball.
19)a) State two effects of a force applied to a non-rigid object.
b) Give one example for each of the effects stated above.
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