1
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Three concentric metallic spherical shells of radii $$R,2R,3R$$ are given charges $$Q_1,Q_2,Q_3$$, respectively. It is found that the surface charge densities on the outer surfaces of the shells are equal. Then, the ratio of the charges given to the shells, $$Q_1:Q_2:Q_3$$, is

A
1 : 2 : 3
B
1 : 3 : 5
C
1 : 4 : 9
D
1 : 8 : 18
2
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

The $$x$$-$$t$$ graph of a particle undergoing simple harmonic motion is shown in the figure. The acceleration of the particle at $$t=4/3$$ s is

IIT-JEE 2009 Paper 1 Offline Physics - Simple Harmonic Motion Question 5 English

A
$${{\sqrt 3 } \over {32}}{\pi ^2}$$ cm/s$$^2$$
B
$${{ - {\pi ^2}} \over {32}}$$ cm/s$$^2$$
C
$${{ {\pi ^2}} \over {32}}$$ cm/s$$^2$$
D
$$ - {{\sqrt 3 } \over {32}}{\pi ^2}$$ cm/s$$^2$$
3
IIT-JEE 2009 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

A ball is dropped from a height of 20 m above the surface of water in a lake. The refractive index of water is 4/3. A fish inside the lake, in the line of fall of the ball, is looking at the ball. At an instant, when the ball is 12.8 m above the water surface, the fish sees the speed of ball as (Take g = 10 m/s$$^2$$)

A
9 m/s
B
12 m/s
C
16 m/s
D
21.33 m/s
4
IIT-JEE 2009 Paper 1 Offline
MCQ (More than One Correct Answer)
+4
-2

For the circuit shown in the figure

IIT-JEE 2009 Paper 1 Offline Physics - Current Electricity Question 3 English

A
The current I through the battery is 7.5 mA.
B
The potential difference across $$R_L$$, is 18 V.
C
Ratio of powers dissipated in $$R_1$$ and $$R_2$$ is 3.
D
If $$R_1$$ and $$R_2$$ are interchanged, magnitude of the power dissipated in $$R_L$$ will decrease by a factor of 9.
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