JEE Main 2017 (Online) 9th April Morning Slot | Rotational Motion Question 138 | Physics

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

The machine as shown has 2 rods of length1 m connected by a pivot at the top. The end of one rod is connected to the floor by a stationary pivot and the end of the other rod has a roller that rolls along the floor in a slot. As the roller goes back and forth, a 2 kg weight moves up and down. If the roller is moving towards right at a constant speed, the weight moves up with a :

JEE Main 2017 (Online) 9th April Morning Slot Physics - Rotational Motion Question 137 English

JEE Main 2017 (Online) 9th April Morning Slot Physics - Rotational Motion Question 137 English

Constant speed

decreasing speed

increasing speed

speed which is $${3 \over 4}$$th of that of the roller when the weight is 0.4 m above the ground

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

A circular hole of radius $${R \over 4}$$ is made in a thin uniform disc having mass M and radius R, as shown in figure. The moment of inertia of the remaining portion of the disc about an axis passing through the point O and perpendicular to the plane of the disc is :

JEE Main 2017 (Online) 9th April Morning Slot Physics - Rotational Motion Question 136 English

JEE Main 2017 (Online) 9th April Morning Slot Physics - Rotational Motion Question 136 English

$${{219\,M{R^2}} \over {256}}$$

$${{237\,M{R^2}} \over {512}}$$

$${{19\,M{R^2}} \over {512}}$$

$${{197\,M{R^2}} \over {256}}$$

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

Moment of inertia of an equilateral triangular lamina ABC, about the axis passing through its centre O and perpendicular to its plane is I_o as shown in the figure. A cavity DEF is cut out from the lamina, where D, E, F are the mid points of the sides. Moment of inertia of the remaining part of lamina about the same axis is :

JEE Main 2017 (Online) 8th April Morning Slot Physics - Rotational Motion Question 140 English

JEE Main 2017 (Online) 8th April Morning Slot Physics - Rotational Motion Question 140 English

$${7 \over 8}$$ I_o

$${15 \over 16}$$ I_o

$${{3\,{{\rm I}_o}} \over 4}$$

$${{31\,{{\rm I}_o}} \over 32}$$

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

In a physical balance working on the principle of moments, when 5 mg weight is placed on the left pan, the beam becomes horizontal. Both the empty pans of the balance are of equal mass. Which of the following statements is correct ?

Left arm is longer than the right arm

Both the arms are of same length

Left arm is shorter than the right arm

Every object that is weighed using this balance appears lighter than its actual weight.

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