Laws of Motion (KVPY Stream-SA (Class 11) Physics): Questions 3 - 4 of 21

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Question number: 3

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2011

MCQ▾

Question

An object with uniform density ρ is attached to a spring that is known to stretch linearly with applied force as shown below.

 A object attached to a spring and immersed in liquid

a Object Attached to a Spring and Immersed in Liquid

Figure shows an object attached to a spring that is known to stretch linearly with applied force as shown below and this object-spring system is immersed in a liquid of density ρ1.

When the spring-object system is immersed in a liquid of density ρ 1 as shown in the figure, the spring stretches by an amount x 1 (ρ > ρ 1). When the experiment is repeated in a liquid of density (ρ 2 < ρ 1), the spring stretches by an amount x 2. Neglecting any buoyant force on the spring, the density of the object is

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 4

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2012

MCQ▾

Question

A ball falls vertically downward and bounces off a horizontal floor. The speed of the ball just before reaching the floor (u1) is equal to the speed just after leaving contact with the floor (u2); u1 = u2. The corresponding magnitudes of accelerations are denoted respectively by a1 and a2. The air resistance during motion is proportional to speed and is not negligible. If g is acceleration due to gravity, then:

Choices

Choice (4) Response

a.

a1 = a2 ≠ g

b.

a1 > a2

c.

a1 = a2 = g

d.

a1 < a2

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