# Physics 2018 | Study Mode

Question 31
A
increases
B
decreases
C
remain the same
D
decreases and later increases
##### Explanation

The velocity ratio and therefore, the mechanical advantage of an inclined plane system increases as $$\theta$$ decreases and vice-versa.

Question 32
A
doubled
B
quartered
C
halved
D
quadrupled
##### Explanation

Given $$K_{1}$$ = $$\frac{mv^{2}}{2}$$.

When v is halved, we have

$$K_{2}$$ = $$\frac{m\times (\frac{v}{2})^{2}}{2}$$

= $$\frac{K_{1}}{4}$$

Hence, the initial kinetic energy is quartered.

Question 33
A
250$$ms^{-1}$$
B
625$$ms^{-1}$$
C
1200$$ms^{-1}$$
D
1500$$ms^{-1}$$
##### Explanation

The fundamental frequency $$(f_{0})$$ = $$\frac{v}{2l}$$

$$f_{0} = 150Hz; l =400cm = 4m$$

$$150 = \frac{v}{2\times 4}$$

$$v = 150 \times 8 = 1200ms^{-1}$$

Question 34
A
4
B
3$$\frac{1}{2}$$
C
2$$\frac{1}{2}$$
D
2
##### Explanation

Explanation not provided, please join discuss, your contributions are welcomed

Question 35
A
resistance box
B
standard resistor
C
shunt resistor
D
multiplier resistor
##### Explanation

Explanation not provided, please join discuss, your contributions are welcomed

Question 36
A
The electrolyte does not need attention
B
It can be recharged
C
It has low internal resistance
D
It has a much longer life than lead-acid accumulator
##### Explanation

Explanation not provided, please join discuss, your contributions are welcomed

Question 37
A
live, neutral and earth
B
neutral, earth and live
C
earth, live and neutral
D
earth, neutral and live
##### Explanation

Explanation not provided, please join discuss, your contributions are welcomed

Question 38
A
I only
B
I and II only
C
II and III only
D
I, II and III
##### Explanation

Capacitors pass AC but block DC signals (when charged up to the applied DC voltage), they are often used to separate the AC and DC components of a signal. Capacitors are also primarily used to store energy.

Question 39
A
$$1.11\times 10^{-7} N$$ towards P
B
$$1.11\times 10^{-7} N$$ towards Q
C
$$9.26\times 10^{-8} N$$ towards P
D
$$9.26\times 10^{-8} N$$ towards Q
##### Explanation

$$F= \frac{Gm_{1}m_{2}}{r^{2}}$$

$$m_{1} = 100kg$$

$$m_{2} = 20kg; r =1.2m$$

$$G= 6.67\times 10^{-11}$$

$$F = \frac{6.67\times 10^{-11}\times 100\times 20}{(1.2)^{2}} = 9.26\times 10^{-8}$$

The acceleration of each object is inversely proportional to the mass, the lighter object will move a bit faster, hence. the force will act in the direction of Q.

Question 40
A
2A
B
3A
C
5A
D
8A
##### Explanation

Ammeters are connected in series so,

A3= A2 + A1

A1 = A3 - A1

= 5A - 2A

= 3A

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