1
MCQ (Single Correct Answer)
A bimetallic strip is made of aluminium and steel $\left(\alpha_{\mathrm{Al}}>\alpha_{\text {steel }}\right)$. On heating, the strip will
A
remain straight
B
get twisted
C
will bend with aluminium on concave side
D
will bend with steel on concave side
2
MCQ (Single Correct Answer)
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
A
its speed of rotation increases
B
its speed of rotation decreases
C
its speed of rotation remains same
D
its speed increases because its moment of inertia increases
3
MCQ (Single Correct Answer)
The graph between two temperature scales $A$ and $B$ is shown in figure between upper fixed point and lower fixed point there are 150 equal division on scale $A$ and 100 on scale $B$. The relationship for conversion between the two scales is given by
A
$\frac{t_A-180}{100}=\frac{t_B}{150}$
B
$\frac{t_A-30}{150}=\frac{t_B}{100}$
C
$\frac{t_B-180}{150}=\frac{t_A}{100}$
D
$\frac{t_B-40}{100}=\frac{t_A}{180}$
4
MCQ (Single Correct Answer)
An aluminium sphere is dipped into water. Which of the following is true?
A
Buoyancy will be less in water at $0^{\circ} \mathrm{C}$ than that in water at $4^{\circ} \mathrm{C}$
B
Buoyancy will be more in water at $0^{\circ} \mathrm{C}$ than that in water at $4^{\circ} \mathrm{C}$
C
Buoyancy in water at $0^{\circ} \mathrm{C}$ will be same as that in water at $4^{\circ} \mathrm{C}$
D
Buoyancy may be more or less in water at $4^{\circ} \mathrm{C}$ depending on the radius of the sphere
5
MCQ (Single Correct Answer)
As the temperature is increased, the period of a pendulum
A
increases as its effective length increases even though its centre of mass still remains at the centre of the bob
B
decreases as its effective length increases even though its centre of mass still remains at the centre of the bob
C
increases as its effective length increases due to shifting to centre of mass below the centre of the bob
D
decreases as its effective length remains same but the centre of mass shifts above the centre of the bob