A block of a certain material is heated to a temperature of $500^{\circ} \mathrm{C}$ and then placed on a large ice block. If 1.455 kg of ice melts, find the mass of the block.
Specific heat of the material is $0.39 \mathrm{Jg}^{-1} \mathrm{C}^{-1}$ and heat of fusion of water is $335 \mathrm{Jg}^{-1}$.
0.67 kg
2.5 kg
1.455 kg
2.67 kg
The critical angle for a typical glass air interface is $42^{\circ}$. If a ray of light falls normally on one of the faces of the prism of angle $45^{\circ}$. The emergent ray will:
Go undeviated
Will pass parallel to the second surface
Will undergo refraction with a refracting angle $45^{\circ}$
Undergo total internal reflection from the second face
Which of the following statements is/are true?
(A) Three vectors not lying in a plane give zero resultant
(B) Three vectors lying in a plane can give zero resultant
(C) Two vectors of different magnitude can be combined to give a zero resultant
Statements (B) and (C)
Statements (A) and (C)
Statement (B)
Statement (A)
Bodies $P, Q, R, S$ are labelled as having charges $Q_P=0.5 \times 10^{-19} C, Q_Q=0.7 \times 10^{-19} C$, $Q_R=2.1 \times 10^{-19} C, Q_S=4.8 \times 10^{-19} C$ respectively.
Select the body having the correct charge.
[Given electronic charge $=e=1.6 \times 10^{-19} \mathrm{C}$ ]
$Q_Q=0.7 \times 10^{-19} C$
$Q_P=0.5 \times 10^{-19} C$
$Q_R=2.1 \times 10^{-19} C$
$Q_s=4.8 \times 10^{-19} C$
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