Monday, October 30, 2017

FORCE TEST PAPER

1.      Impulse is

(a)    A scalar quantity

(b)   A vector quantity

(c)    Neither a scalar nor a vector

(d)   Sometimes a scalar and sometimes a vector 

2.      A long-jumper runs before jumping because

(a)    He covers a greater distance

(b)   He maintains momentum conservation

(c)    He gains energy by running

(d)   He gains momentum

3.      If a rock is brought from the surface of the moon

(a)    Its mass will change

(b)   Its weight will change, but not mass

(c)    Both mass and weight will change

(d)   Its mass and weight will remain the same  

4.      The weight of a body would not be zero

(a)    At the centre of the earth

(b)   During a free fall

(c)    In interplanetary space

(d)   On a frictionless surface

5.      A man is standing on a boat in still water. If he walks towards the shore the boat will

(a)    Move away from the shore

(b)   Remain stationary

(c)    Move towards the shore

(d)   Sink

6.      During a planned manoeuvre in space flight, a free-floating astronaut A pushes another free-floating astronaut B, the mass of A being greater than that of B. Then, the magnitude of the force exerted by astronaut A on astronaut B is

(a)    Equal to zero

(b)   Equal to the force exerted by B on A

(c)    Greater than the force exerted by B on A

(d)   Less than the force exerted by B on A

7.      If the momentum of a body is doubled, the kinetic energy is

(a) Halved

(b) Unchanged

(c) Doubled                      

(d) Becomes 4 times

8.      Momentum is a measure of

(a) Weight                        

(b) Mass

(c) Quantity of motion      

(d) Velocity

9.      A rocket works on the

(a)    First law of motion

(b)   Second law of motion

(c)    Third law of motion

(d)   Law of conservation of energy  

10.  A metallic ball strikes a wall and falls down whereas a tennis ball having the same mass and velocity bounces back. The reason for this is that

(a)    Both suffer equal change in momentum

(b)   The tennis ball suffers a grater change in momentum

(c)    Metallic ball suffers a grater change in momentum

(d)   The momentum of the tennis ball is less than that of the metallic ball.

11.  When a bicycle travels on a rough surface, its speeds

(a) Increases                      

(b) Decreases

(c) Remains the same        

(d) None of these

12.  It is difficult to walk on ice because of

(a)    Absence of friction

(b)   Absence of inertia

(c)    More inertia                 

(d) More friction

13.  The law which defines force is

(a)    Newton's third law of motion

(b)   Newton's first law of motion

(c)    Newton's second law of motion

(d)   Newton's law of gravitation

14.  Friction between any two objects is due to

(a)    Attraction between them

(b)   Repulsion between them

(c)    Some adhesive forces between them

(d)   Irregularities on the surfaces 

15.  1 dyne is equal to

(a) 980 g wt                       

(b) 1/980 g wt

(c) 980 kg wt                    

(d) None of these

16.  Newton used the phrase 'quantity of motion' for

(a)    Momentum

(b)   Force

(c)    Acceleration due to gravity

(d)   None of these

17.  Galileo's law of inertia is another name for newton's …. low of motion.

(a) First                             

(b) Second

(c) Third                           

(d) Any one of the above

18.  Graphite powder is used in machines to

(a) Enhance friction         

(b) Enhance profit

(c) Reduce friction           

(d) Reduce efficiency 

19.  You are marooned on a frictionless horizontal surface and cannot exert any horizontal force by pushing against the surface. How can you get off?

(a)    By jumping

(b)   By spitting our sneezing

(c)    By rolling you body on the surface

(d)   By running on the plane

20.  A bullet in motion hits and gets embedded in a solid resting on a frictionless table. what is conserved?

(a)    Momentum and kinetic energy

(b)   Momentum alone

(c)    Kinetic energy alone

(d)   Neither momentum nor kinetic energy 

21.  The hot air balloon rises because it is

(a) Denser                          

(b) Less dense

(c) Equally dense              

(d) Equally dense

22.   A piece of wood floats in water. What happens to it in alcohol?

(a) Floats higher                

(b) Stays as before

(c) Sinks                            

(d) Sinks and rises

23.  A boat full of iron nails is floating on water in a lake. When the iron nails are removed. The water level

(a) Rises                            

(b) Falls

(c) Remains the same       

(d) Nothing can be said

24.  Pascal is the unit for

(a) Pressure                        

(b) Thrust

(c) Buoyant force              

(d) None of these

25.  At sea level, atmospheric pressure is

(a)    75 cm of Hg column

(b)   0.76 cm of Hg column

(c)    76 m of Hg column

(d)   76 cm of water column

26.  Atmospheric pressure is measured by a

(a)    Doctor's thermometer

(b)   Speedometer

(c)    Mercury barometer

(d)   None of these

27.  The mercury barometer was invented by

(a) Celsius                                     

(b) Fahrenheit

(c) Torricelli                      

(d) Bernoulli

28.  The weather forecasting department uses-as the unit of pressure.

(a) Bar                               

(b) N m-2

(c) Pa                                

(d) mm of Hg

29.  The atmospheric pressure at the surface of the earth is about

(a) 103 N m-2                      

(b) 105 N m-2

(c) 10-3 N m-2                    

(d) 10-5 N m-2

30.  The density of water is

(a) 10-3 kg m-3                   

(b) 10-2 kg m-3

(c) 102 kg m-3                    

(d) 103 kg m-3

31.  Any solid will sink in water if its relative density is

(a)    Less than unity

(b)   Equal to unity

(c)    Greater than unity

(d)   Infinite

32.  Any solid will not sink in water if its relative density is

(a)    Less than 1                 

(b)   Equal to 1

(c)    Greater than 1

(d)Infinite   

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