Subject: Physics, asked on 3/5/18

## Q. please derive this equation of discharging current in rc circuit $i=\frac{E}{R}{e}^{-t/RC}$

Subject: Physics, asked on 1/5/18

## Q32. The rms value of potential difference V shown in the figure is (1) $\frac{{V}_{0}}{2}$                                (2) $\frac{{V}_{0}}{\sqrt{3}}$ (3) ${V}_{0}$                                  (4) $\frac{{V}_{0}}{\sqrt{2}}$

Subject: Physics, asked on 1/5/18

## Please explain no.23. Answer is (2)

Subject: Physics, asked on 1/5/18

## An AC source of 25 volt, 60 Hz i applied across C-R series circuit as shown. If voltage across resistnace is 20 volt, then voltage across capacitor is (1) 20 V (2) 15 V (3) 25 V (4) Cannot be calculated unless value of C is not given

Subject: Physics, asked on 21/4/18

## Solve this: 47. An an A.C. circuit, the current flowing is i = 5 sin(100t ) amp and the potential difference is V = 200 sin 100t volt. The power consumption is equal to (a)   1000 W (b)  40 W (c)  20 W (d)  0 W

Subject: Physics, asked on 19/4/18

## 10. 22 gm of CO2 at 27°C mixed with 60 gm of O2 at 37°C. The temperature of mixture is (a) 27°C                                     (b) 30.5°C (c) 32°C                                     (d) 37°C

Subject: Physics, asked on 18/4/18
Subject: Physics, asked on 17/4/18

## Solve this: ​Q9. A plane electromagnetic wave of frequency 20 MHz travels through a space along x direction. If the electric field vector at a certain point in space is 6 V m–1, what is the magnetic field vector at that point?       (1) 2 × 10–8 T                                (2)        (3) 2 T                                            (4) $\frac{1}{2}\mathrm{T}$

Subject: Physics, asked on 16/4/18
Subject: Physics, asked on 6/4/18

## Solve qus no. 18 Q.18. A carnot engine operates between a sink at temperature 300 K and a source at temperature 11 Kelvin. It takes 200 J of heat from the source and delivers 120 J to sink in a cycle. The temperature of the source is (a) 400 K (b) 500 K (c) 600 K (d) None

Subject: Physics, asked on 29/3/18

## Q. A car travels half of its journey with the speed of 30 m/s and next half with speed of v. If average speed pf the car is 24 m/s, then speed of the car in second half is 30 m/s 20 m/s 40 m/s 50 m/s

Subject: Physics, asked on 29/3/18

## Solve this: Please answer the 40th question- 40. Acceleration versus time graph of a moving object is given below. Velocity of the object will be at t = 4 second (Initial velocity is zero): (1) 1 m/s                                          (2) 8 m/s (3) 4 m/s                                          (4) $\frac{1}{2}$ m/s

Subject: Physics, asked on 21/3/18

## Q. The time period of oscillations of single pendulum is T = 2$\mathrm{\pi }$$\sqrt{L/g}$  . L is about 10 cm and known to 1 mm accuracy . The time period of oscillations is about 0.5 s .  The time of 100 oscillations is measured with a wrist watch  of 1s  resolution . What is the accuracy in determination of  'g' ?    (1)  1%  (2) 3 %  (3) 5 % (4)  7 %

Subject: Physics, asked on 15/3/18

## Q.  A voltmeter of '0-50mv' range of resistance 50 $\Omega$ will have to convert with an Ammeter of range '0- 10A'.  How it will be done ? What happens when ammeter is connected in a circuit with parallel ?

Subject: Physics, asked on 15/3/18