KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 210 - 213 of 268

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Question number: 210

» Physics and Measurement » Accuracy and Precision of Measuring Instruments

MCQ▾

Question

In an experiment, on the measurement of g, using a simple pendulum, the time period was measured with an accuracy of 0.3 % while the length was measured with an accuracy of 0.4%. What is the percentage accuracy in the value of g thus obtained?

Choices

Choice (4) Response

a.

1 %

b.

0.9 %

c.

1.2 %

d.

0.7 %

Question number: 211

» Work, Energy and Power » Conservative and Non-Conservative Forces

Appeared in Year: 2015

MCQ▾

Question

Two small metal balls of different mass m1 and m2 are connected by strings of equal length to fixed point. When the balls are given charges, the angles that the two strings make with the vertical are 300 and 600, respectively. The ratio is close to –

Choices

Choice (4) Response

a.

3.0

b.

1.7

c.

0.58

d.

2.0

Question number: 212

» Atoms and Nuclei » Half Life and Mean Life

MCQ▾

Question

A nucleus has a half – life of 45 minutes. At 2: 45 PM its decay rate was measured as 160, 000 counts/sec. What will be the decay rate at 5: 45 PM?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 213

» Center of Mass » Centre of Mass of a Rigid Body

Appeared in Year: 2015

MCQ▾

Question

Two spherical object each of radii R and mass m1 and m2 are suspended using two strings of equal length L as shown in the figure (R < < L). The angle, θ which mass m2 makes with the vertical is approximately,

Two spherical objects are suspended using two strings

Two Spherical Objects Are Suspended Using Two Strings

In figure two spherical objects each of radii R and mass m1 and m2 are suspended using two strings of equal length L.

Choices

Choice (4) Response

a.

b.

c.

d.

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