PEQ The given graph represents V-I characteristic for a semiconductor device. Which of the following statement is correct? 313039 expand A It is V-I characteristic for solar cell where, point A represents open circuit voltage and point B short circuit current. B It is for a solar cell and points A and B represent open circuit voltage and current, respectively. C It is for a photodiode and points A and B represent open circuit voltage and current respectively. D It is for a LED and points A and B represent open circuit voltage and short circuit current, respectively. Ruhul Amin Alig
PYQ In Young's double-slit experiment, if the separation between coherent sources is halved and the distance of the screen from the coherent sources is doubled, then the fringe width becomes: 1. half 2. four times 3. one-fourth 4. double Ruhul Amin Alig
PEQ A concave mirror gives an image three times as large as its object placed at a distance of 20 cm from it. For the image to be real, the focal length should be (a) 10 cm (c) 20 cm (b) 15 cm (d) 30 cm Ruhul Amin Alig
PEQ The potential difference V A − V B VA-VB between the points A and B in the given figure is : The potential difference (VA - VB) between the points A and 1. -3V 2. +3V 3. +6V 4. +9V Ruhul Amin Alig
PEQ See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it? 1. ε 1 − ( i 1 + i 2 ) R − i 1 r 1 = 0 ε1−(i1+i2)R−i1r1=0 2. ε 2 − i 2 r 2 − ε 1 − i 1 r 1 = 0 ε2−i2r2−ε1−i1r1=0 3. − ε 2 − ( i 1 + i 2 ) R + i 2 r 2 = 0 −ε2−(i1+i2)R+i2r2=0 4. ε 1 − ( i 1 + i 2 ) R + i 1 r 1 = 0 ε1−(i1+i2)R+i1r1=0 Ruhul Amin Alig
