1
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

If the speed of an electron of hydrogen atom in the ground state is $2.2 \times 10^6 \mathrm{~m} / \mathrm{s}$, then its speed in the third excited state will be

A
$5.5 \times 10^6 \mathrm{~m} / \mathrm{s}$
B
$5.5 \times 10^5 \mathrm{~m} / \mathrm{s}$
C
$8.8 \times 10^5 \mathrm{~m} / \mathrm{s}$
D
$6.8 \times 10^6 \mathrm{~m} / \mathrm{s}$
2
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A rod $l \mathrm{~m}$ long is acted upon by a couple as shown in the figure. The moment of couple is $\tau \mathrm{~Nm}$. If the force at each end of the rod, then magnitude of each force is

$$\left(\sin 30^{\circ}=\cos 60^{\circ}=0.5\right)$$

MHT CET 2019 3rd May Morning Shift Physics - Rotational Motion Question 3 English

A
$\frac{\tau}{l}$
B
$\frac{l}{2 \tau}$
C
$\frac{2 \tau}{l}$
D
$\frac{2}{\tau}$
3
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

The vectors $(\mathbf{A}+\mathbf{B})$ and $(\mathbf{A}-\mathbf{B})$ are at right. angles to each other. This is possible under the condition

A
$|A|=|B|$
B
$A \cdot B=0$
C
$A \cdot B=1$
D
$A \times B=0$
4
MHT CET 2019 3rd May Morning Shift
MCQ (Single Correct Answer)
+1
-0

A coil has inductance 2 H . The ratio of its reactance, when it is connected first to an $A C$ source and then to DC source, is

A
zero
B
1
C
less than 1
D
infinity
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