1
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A nucleus A, with a finite de-broglie wavelength $$\lambda $$A, undergoes spontaneous fission into two nuclei B and C of equal mass. B flies in the same direction as that of A, while C flies in the opposite direction with a velocity equal to half of that of B. The de-Broglie wavelengths $$\lambda $$B and $$\lambda $$C of B and C are respectively :
A
$$\lambda $$A, 2$$\lambda $$A
B
2$$\lambda $$A, $$\lambda $$A
C
$$\lambda $$A, $$\lambda $$A/2
D
$$\lambda $$A/2, $$\lambda $$A
2
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A body of mass m1 moving with an unknown velocity of $${v_1}\mathop i\limits^ \wedge $$, undergoes a collinear collision with a body of mass m2 moving with a velocity $${v_2}\mathop i\limits^ \wedge $$ . After collision, m1 and m2 move with velocities of $${v_3}\mathop i\limits^ \wedge $$ and $${v_4}\mathop i\limits^ \wedge $$ , respectively. If m2 = 0.5 m1 and v3 = 0.5 v1, then v1 is :-
A
$${v_4} - {{{v_2}} \over 2}$$
B
$${v_4} - {{{v_2}} \over 4}$$
C
$${v_4} - {v_2}$$
D
$${v_4} + {v_2}$$
3
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
In the figure shown, what is the current (in Ampere) drawn from the battery ?
You are given: R1 = 15$$\Omega $$, R2 = 10 $$\Omega $$, R3 = 20 $$\Omega $$, R4 = 5$$\Omega $$, R5 = 25$$\Omega $$, R6 = 30 $$\Omega $$, E = 15 V JEE Main 2019 (Online) 8th April Evening Slot Physics - Current Electricity Question 255 English
A
13/24
B
7/18
C
9/32
D
20/3
4
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
If surface tension (S), Moment of inertia (I) and Planck's constant (h), were to be taken as the fundamental units, the dimensional formula for linear momentum would be :-
A
S1/2I1/2h0
B
S3/2I1/2h0
C
S1/2I1/2h-1
D
S1/2I3/2h-1
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