GATE PH 2026 Paper 1 — page 6

Questions 16–18 of 65. Imported answers require review unless explicitly marked reviewed.

On a horizontal plane, a projectile of mass

is launched from the ground with speed

at an angle

with the horizontal. In addition to the gravitational force (

), it also experiences a drag force

, where

is its velocity and

is a constant. It hits the ground at a distance

from the point of launch with its velocity making an angle

with the horizontal, as shown schematically in the figure. Then which of the following options is correct?

Your answerChoose one option.

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Consider the Otto cycle for an ideal gas engine consisting of two quasistatic adiabatic and two quasistatic isochoric processes. The correct temperature-entropy (T-S) phase diagram for the cycle is

Your answerChoose one option.

Diagram for Physics question 17 (figure 2)

Diagram for Physics question 17 (figure 3)

Diagram for Physics question 17 (figure 4)

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The formula for energy

of a photon gas at temperature

in a two-dimensional box at equilibrium with

denoting the density of states of photons is given below where symbols

and

have their standard meaning. The specific heat (

) of this photon gas obeys

Your answerChoose one option.

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2026 · Paper 1

Question 16

Question 17

Question 18