1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Point charges $-3 Q,-q, 2 q$ and $2 Q$ are placed, one at each corner of a square. The relation between Q and q for which the potential at the centre of the square is zero is
A
$Q=\frac{1}{q}$
B
$Q=-q$
C
$Q=\frac{-1}{q}$
D
$Q=q$
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
If $R$ and $L$ denote resistance and inductance of a material, then the dimension of $L R$ will be:
A
$M^2 L^4 T^{-5} A^{-4}$
B
$M L T A^{-1}$
C
$M^0 L^0 T^0 A^0$
D
$M^{-1} L^4 T A^{-3}$
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A student measures the terminal potential difference $V$ of a cell (emf $\varepsilon$ and internal resistance $r$ ) as a function of current I flowing through it, and draws V versus I graph. The slope and intercept of the graph respectively are
A
$-r,-\varepsilon$
B
$-r, \varepsilon$
C
$r,-\varepsilon$
D
$r, \varepsilon$
4
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A galvanometer of resistance $50 \Omega$ is connected to a battery of 4 V along with a resistance of $3950 \Omega$ in series. A full-scale deflection of 30 divisions is obtained in the galvanometer. In order to reduce this deflection to 10 divisions, the resistance in series should be equal to:
A
8950 ohm
B
11950 ohm
C
7000 ohm
D
6000 ohm
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