1
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A air bubble of radius 1 cm in water has an upward acceleration 9.8 cm s–2. The density of water is 1 gm cm–3 and water offers negligible drag force on the bubble. The mass of the bubble is (g = 980 cm/s2).
A
1.52 gm
B
4.51 gm
C
3.15 gm
D
4.15 gm
2
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A Tennis ball is released from a height h and after freely falling on a wooden floor it rebounds and reaches height $${h \over 2}$$. The velocity versus height of the ball during its motion may be represented graphically by :
(graph are drawn schematically and on not to scale)
A
JEE Main 2020 (Online) 4th September Morning Slot Physics - Motion in a Straight Line Question 77 English Option 1
B
JEE Main 2020 (Online) 4th September Morning Slot Physics - Motion in a Straight Line Question 77 English Option 2
C
JEE Main 2020 (Online) 4th September Morning Slot Physics - Motion in a Straight Line Question 77 English Option 3
D
JEE Main 2020 (Online) 4th September Morning Slot Physics - Motion in a Straight Line Question 77 English Option 4
3
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Particle A of mass mA = $${m \over 2}$$ moving along the x-axis with velocity v0 collides elastically with another particle B at rest having mass mB = $${m \over 3}$$. If both particles move along the x-axis after the collision, the change $$\Delta $$$$\lambda $$ in de-Broglie wavlength of particle A, in terms of its de-Broglie wavelength ($$\lambda $$0) before collision is :
A
$$\Delta $$$$\lambda $$ = $${5 \over 2}{\lambda _0}$$
B
$$\Delta $$$$\lambda $$ = $${3 \over 2}{\lambda _0}$$
C
$$\Delta $$$$\lambda $$ = 2$$\lambda $$0
D
$$\Delta $$$$\lambda $$ = 4$$\lambda $$0
4
JEE Main 2020 (Online) 4th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A battery of 3.0 V is connected to a resistor dissipating 0.5 W of power. If the terminal voltage of the battery is 2.5 V, the power dissipated within the internal resistance is :
A
0.50 W
B
0.072 W
C
0.10 W
D
0.125 W
JEE Main Papers
2023
2021
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12