1
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

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 $335 \mathrm{Jg}^{-1}$.

A

0.67 kg

B

2.5 kg

C

1.455 kg

D

2.67 kg

2
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

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:

A

Go undeviated

B

Will pass parallel to the second surface

C

Will undergo refraction with a refracting angle $45^{\circ}$

D

Undergo total internal reflection from the second face

3
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

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

A

Statements (B) and (C)

B

Statements (A) and (C)

C

Statement (B)

D

Statement (A)

4
COMEDK 2026 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

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 $=e=1.6 \times 10^{-19} \mathrm{C}$ ]

A

$Q_Q=0.7 \times 10^{-19} C$

B

$Q_P=0.5 \times 10^{-19} C$

C

$Q_R=2.1 \times 10^{-19} C$

D

$Q_s=4.8 \times 10^{-19} C$