1
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

$N$ number of balls of mass $m \mathrm{~kg}$ moving along positive direction of $X$ - axis, strike a wall per second and return elastically. The velocity of each ball is $u \mathrm{~m} / \mathrm{s}$. The force exerted on the wall by the balls in newton, is

A
0
B
$2 m N u$
C
$\frac{m N u}{2}$
D
$m N u$
2
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

Metal rings $P$ and $Q$ are lying in the same plane, where current I is increasing steadily. The induced current in metal rings is shown correctly in figure

MHT CET 2020 19th October Evening Shift Physics - Electromagnetic Induction Question 38 English

A
MHT CET 2020 19th October Evening Shift Physics - Electromagnetic Induction Question 38 English Option 1
B
MHT CET 2020 19th October Evening Shift Physics - Electromagnetic Induction Question 38 English Option 2
C
MHT CET 2020 19th October Evening Shift Physics - Electromagnetic Induction Question 38 English Option 3
D
MHT CET 2020 19th October Evening Shift Physics - Electromagnetic Induction Question 38 English Option 4
3
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A 10 m long wire of resistance $20 \Omega$ is connected in series with a battery of emf 3 V and a resistance of $10 \Omega$. The potential gradient along the wire in $\mathrm{V} / \mathrm{m}$ is

A
1.2
B
0.10
C
0.02
D
0.20
4
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A domain in a ferromagnetic substance is in the form of a cube of side $1 \mu \mathrm{~m}$. If it contains $8 \times 10^{10}$ atoms and each atomic dipole has a dipole moment of $9 \times 10^{-24} \mathrm{Am}^2$, then the magnetisation of the domain is

A
$7.2 \times 10^5 \mathrm{Am}^{-1}$
B
$7.2 \times 10^3 \mathrm{Am}^{-1}$
C
$7.2 \times 10^9 \mathrm{Am}^{-1}$
D
$7.2 \times 10^{12} \mathrm{Am}^{-1}$
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