1
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The number of integral values of m for which the quadratic expression, (1 + 2m)x2 – 2(1 + 3m)x + 4(1 + m), x $$ \in $$ R, is always positive, is :
A
7
B
8
C
3
D
6
2
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The total number of irrational terms in the binomial expansion of (71/5 – 31/10)60 is :
A
54
B
55
C
49
D
48
3
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An ideal gas is enclosed in a cylinder at pressure of 2 atm and temperature 300 K. The mean time between two successive collisions is 6 $$ \times $$ 10–8 s. If the pressure is doubled and temperature is increased to 500 K, the mean time between two successive collisions will be close to
A
0.5 $$ \times $$ 10$$-$$8 s
B
4 $$ \times $$ 10$$-$$8 s
C
3 $$ \times $$ 10$$-$$6 s
D
2 $$ \times $$ 10$$-$$7 s
4
JEE Main 2019 (Online) 12th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A particle of mass 20 g is released with an initial velocity 5 m/s along the curve from the point A, as shown in the figure. The point A is at height h from point B. The particle slides along the frictionless surface. when the particle reaches point b, its angular momentum about O will be :
(Take g = 10 m/s2)

JEE Main 2019 (Online) 12th January Evening Slot Physics - Rotational Motion Question 143 English
A
6 kg-m2/s
B
8 kg-m2/s
C
2 kg-m2/s
D
3 kg-m2/s
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