1
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The bob of a simple pendulum has mass 2g and a charge of 5.0 μC. It is at rest in a uniform horizontal electric field of intensity 2000 V/m. At equilibrium, the angle that the pendulum makes with the vertical is : (take g = 10 m/s2)
A
tan–1(5.0)
B
tan–1(2.0)
C
tan–1(0.5)
D
tan–1(0.2)
2
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Two identical beakers A and B contain equal volumes of two different liquids at 60°C each and left to cool down. Liquid in A has density of 8 × 102 kg/m3 and specific heat of 2000 J kg–1 K–1 while liquid in B has density of 103 kg m–3 and specific heat of 4000 J kg–1 K–1. Which of the following best describes their temperature versus time graph schematically? (assume the emissivity of both the beakers to be the same)
A
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 293 English Option 1
B
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 293 English Option 2
C
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 293 English Option 3
D
JEE Main 2019 (Online) 8th April Morning Slot Physics - Heat and Thermodynamics Question 293 English Option 4
3
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B$${\mathop i\limits^ \wedge }$$ . The torque on the coil due to the magnetic field is :
A
$${{B{r^2}I} \over {\pi N}}$$
B
B$$\pi $$r2IN
C
Zero
D
$${{B\pi{r^2}I} \over { N}}$$
4
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Water from a pipe is coming at a rate of 100 litres per minute. If the radius of the pipe is 5 cm, the Reynolds number for the flow is of the order of : (density of water = 1000 kg/m3, coefficient of viscosity of water = 1mPas)
A
106
B
104
C
103
D
102
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