1
NEET 2019
MCQ (Single Correct Answer)
+4
-1
When a block of mass M is suspended by a long wire of length L, the length of the wire becomes (L + $$l$$). The elastic potential energy stored in the extended wire is :
A
Mgl
B
mgL
C
$${1 \over 2}$$Mgl
D
$${1 \over 2}$$MgL
2
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A small hole of area of cross-section 2 mm2 present near the bottom of a fully filled open tank of height 2 m. Taking g = 10 m/s2, the rate of flow of water through the open hole would be nearly :
A
8.9 × 10–6 m3/s
B
2.23 × 10–6 m3/s
C
6.4 × 10–6 m3/s
D
12.6 × 10–6 m3/s
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
The unit of thermal conductivity is :
A
J m–1 K–1
B
W m K–1
C
J m K–1
D
W m–1 K–1
4
NEET 2019
MCQ (Single Correct Answer)
+4
-1
A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 $$ \times $$ 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the free surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 is :
A
1 cm
B
10 cm
C
100 cm
D
0.5 cm
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