1

A tuber of cassava can be processed into powder. This explains the face that

A

matter can change sponteneously from one state to another

B

matter cannot be destroyed

C

force is required to change natter from one state to another

D

matter is made up of tiny particle

CORRECT OPTION:
d

2

A piece of metal of relative density 5.0 weighs 60N in air. Calculate its weight when fully immersed in water

A

4N

B

5N

C

48N

D

60N

CORRECT OPTION:
c

R.D = \(\frac{m}{m - m_2} = 5 = \frac{6}{60 - m_1} = \frac{240}{5} = 48N\)

3

The tendency of a body to remain at least when a force is supplied to it is called

A

impulse

B

momentum

C

inertia

D

friction

CORRECT OPTION:
c

4

A force acts on a body for 0.5s changing its momentum from 16.0kg ms^{-1} to 21.0kgms^{-1}, calculate the magnitude of the force

A

42.0N

B

37.0N

C

32.0N

D

10.0N

CORRECT OPTION:
d

F = \(\frac{mv - mu}{1} = \frac{21 - 16}{0.5} = 10N\)

5

A moving object is said to have a uniform acceleration if its

A

displacement decreases at a constant rate

B

speed is directly proportional with time

C

velocity increases by equal amount in equal time intervals

D

velocity varies inversely with time

CORRECT OPTION:
c

6

The period of an oscillatory motion is defined as the

A

average of the time used in completing different numbers of oscillations

B

time to complete a number of oscillations

C

time to complete one oscillation

D

time taken to move from one extreme position to another

CORRECT OPTION:
c

7

The mass on a loaded spiral spring oscillates vertically between two extreme positions P and R equidistant from the equilibrium position Q. Which of the following statements about the system is not correct

A

the momentum of the mass is maximum at Q

B

the elastic potential energy of the spring is maximum at Q

C

the kinetic energy of the mass is maximum at P

D

the total energy of the system is always constant

CORRECT OPTION:
d

8

A ball f mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms^{-1}. Determine the magnitude of the resulting impulse

A

2.0kgms^{-1}

B

10.0kgms^{-1}

C

5.0kgms^{-1}

D

2.5kgms^{-1}

CORRECT OPTION:
b

I = Ft = m(v - u) = 5 x 2

= 10kgms^{-1}

= 10kgms

9

Which of the following statements correctly defines a simple machine? a device

A

that can provide electric current

B

which can only carry people from one place to another

C

with which work can be done easily

D

which changes the state of rest or of uniform motion of an object along a straight ine

CORRECT OPTION:
c

10

A platinum resistance thermometer has a resistance 4\(\Omega\) at 0^{o}C and 100\(\Omega\) at 100^{o}C. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45^{o}C

A

14.0\(\Omega\)

B

6.7\(\Omega\)

C

3.2\(\Omega\)

D

2.7\(\Omega\)

CORRECT OPTION:
b

\(\frac{R - 4}{10 - 4} = \frac{45 - 0}{100 - 0}\)

R = \(\frac{670}{100} = 6.7\Omega\)

R = \(\frac{670}{100} = 6.7\Omega\)

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