ENNYSTON SCIENCE COMPETITION: 3RD ROUND - SENIOR 1

1.   An object moves 4m eastward and then 3m southwards. The magnitude of its displacement from its original position is?

                             

• A.  1   

•   B. 5  

• C. 7

• D. 12

A piece of wood is floating on water. The forces acting on the wood is are

                        

• A.  Upthrust and reaction

• B. weight and reaction

• C. weight and upthrust    

•      D. upthrust and viscosity

1.   The pressure at any point in a liquid at rest depends only on the

                              

• A.  Depth and the density  

•   B. mass and volume

•   C. quantity and the surface area

• D. surface area and the viscosity

  An object of mass 80kg is pulled on a horizontal rough ground by a force of 500N. Find the coefficient of static friction.

                                              

• A.  0.8    

• B. 0.4  

• C. 1.0 

•   0.6

1.   What is the work done in raising 700 kg of iron ore to the surface from a depth of 80m. Take g = 10 m/s2.

                                     

• A.  560 000 J

•   B. 560 000 W  

•    C. 560 000 Pa

• D. 560 000 N

Three variables w ,x and y are such that x varies directly as w and inversely as the square of y. If x = 4, w = 3 and y = 6, find the constant of variation.

• (a) 20

• (b) 27

• (c) 32

• (d) 48

Find the next term of the sequence: 2,4,7,11,16,...

• (a) 38

• (b) 23

• (c)34

• (d)22

The 5^th term of the AP is 15 and its first term is 3,find its common difference 

• 1

• 3

• 4

• 6

If sinx = 3/5, what is the value of tanx

• 4/3

• 3/5

• 1/5

• 3/4

The roots of a quadratic equation are -1 and 5 . Find the equation.

• (x + 1)(x-5)

• (x+1)(x+5)

• (x-1)(x+5)

• (x-1)(x-5)