# Physics (2017) | Study Mode

Question 31
A

125kgms-1

B

25kgms-1

C

15kgms-1

D

0kgms-1

##### Explanation

Impulse = momentum

Impulse = Force (f) $$\times$$ time (t)

Momentum = mass (m) $$\times$$ velocity (v)

Ft = Final momentum - initial momentum

FT = mv - mu

Since it is initially at rest u = 0

5 x 5 = mv ? m(0)

25 = mv

Final momentum = 25kgms$$^{-1}$$

Question 32
A
II and III only
B
I, II and III
C
I and II only
D
I and III only
##### Explanation
Refraction, Interference and diffraction are all properties of waves

Question 33
A
II and III only
B
I, II and III
C
I and II only
D
I and III only
##### Explanation
Refraction, Interference and diffraction are all properties of waves

Question 34
A
Primary cell produces a large current for a long time
B
Secondary cell has a very high internal resistance
C
Primary cell has a very low internal resistance
D
Secondary cell has a very low internal resistance
##### Explanation
Primary cells are used up gradually often the cells are use and it can't be recharged
Secondary cells or accumulated can be recharged and used for a long period of time and their main advantage is that they have low internal resistance

Question 35
A
copper
B
silicon
C
plastic
D
Iron
##### Explanation
Semi-conductor have an elecctric conductivity intermediate in value between that of a pure metal and a good insulator. Silicon is an example

Question 36
A
white
B
red
C
black
D
blue
##### Explanation
A black solution is a better radiator of heat and allow a better absorber of heat.

Question 37
A

An electron

B

- particle

C

- particle

D

proton

##### Explanation

Nucleus of atom is made up of neutron and proton

Question 38
A
thermometer
B
hydrometer
C
spring balance
D
beaker
##### Explanation
Thermometer is used to measure temperature
Hydrometer is used to measure relative density of liquid.
Spring balance is used to measure the weight of an object
Beaker is used to measure or take volume of a liquid

Question 39
A

100 rads$$^{-1}$$

B

200 rads$$^{-1}$$

C

50 rads$$^{-1}$$

D

400 rads$$^{-1}$$

##### Explanation

1 cycle = 3600 = 2 rad

angular speed = 50 cycles per seconds = 100 rads$$^{-1}$$

Question 40
A
diffusion
B
osmosis
C
capillarity
D
surface tension
##### Explanation
Capillarity is the tendency of a liquid to rise or fall in a narrow tube and it explains why a blotting paper absorbs ink

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