Correct Answer:- Option-A
Question19:-If *3 cos*{-1}(x) + 2 sin*{-1}(x)={3pi}/2°_, then the value of ` >` ऽ
A:*(1)/(2)°

(1)/(sqrt(2))*
ഉ:- (sqrt(3))/(2)°
Correct Answer:- Option-B

Question20:-A straight line passes through *P(2, 3) is such that its intercepts between the axes is bisected at ‘P*. Then the
straight line is

A:-3x + 2y =6°

@:- 29 + 3४ = 24
D:-3x + 2y = 12°
Correct Answer:- Option-D
Question21:-An RLC series circuit has a resistance R of 20 Q and a current which lags behind the applied voltage by 45°. If
the voltage across the inductor is twice the voltage across capacitor, what is the value of inductive reactance?
‏-ھ‎ 02
8:-20೧
C:-40 0
0:-60 9
Correct Answer:- Option-C
Question22:-Three currents *i_1, i_2, i_3° are approaching a node if *i_l = 10sin(400t+60*0)A* and* i_2 = 10sin(400t -
60₹0)& . Then 13%
‏۸۵ھ‎
‎(105൨൧000 മ"
10510 4000) &
Ssqrt(3)chi3cos400t)A*
Correct Answer:- Option-C

Question23:-A water boiler at home is switched on to the ac mains supplying power at 230 V/50 Hz. The frequency of
instantaneous power consumed by the boiler is

A:-0 Hz
B:-50 Hz
C:-150 Hz
D:-100 Hz
Correct Answer:- Option-D
Question24:-Which of the following statement with magnetic field is correct?
A:-The electric current always produces a magnetic field
B:-The electric current produces magnetic field only in presence of a coil
C:-The electric current produces magnetic field only in presence of iron core
D:-Only large current produces magnetic field
Correct Answer:- Option-A

Question25:-When a pure resistor R = 100 Q has an applied voltage’v = 200 sin314t’. The average power in the 100 Q
resistor is‘ *

A:-100 W

B:-200 W

C:-400 W

D:-800 W

Correct Answer:- Option-B
Question26:-The red colour of brick is due to

A--iron oxide

B:-magnesia

C:-silica

D:-alumina

Correct Answer:- Option-A
Question27:-Purest form of iron is

A:-mild steel

B:-cast iron

C:-high carbon steel

D:-wrought iron

Correct Answer:- Option-D