1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Which colour of the light has the longest wavelength?
A
blue
B
violet
C
red
D
green
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
Increase in tempertaure of a gas filled in a container would lead to :
A
increase in its kinetic energy
B
decrease in intermolecular distance
C
decrease in its pressure
D
increase in its mass
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in tmperature. The length of aluminium rod is : ($$\alpha $$Cu = 1.7 × 10–5 K–1 and $$\alpha $$Al = 2.2 × 10–5 K–1)
A
119.9 cm
B
88 cm
C
68 cm
D
6.8 cm
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
Change Language
A block of mass 10 kg is in contact against the inner wall of a hollow cylindrical drum of radius 1 m. The coefficient of friction between the block and the inner wall of the cylinder is 0.1. The minimum angular velocity needed for the cylinder to keep the block stationary when the cylinder is vertical and rotating about its axis, will be : (g = 10 m/s2)
A
$${{10} \over {2\pi }}$$ rad/s
B
10 rad/s
C
10 $$\pi $$ rad/s
D
$$\sqrt {10} $$ rad/s