A calorie is a unit of heat (energy in transit) and it equals about \(4.2\) J where \(1\) J\(=1\) kg-m2s-2Suppose we employ a system of units in which the unit of mass equals \(\alpha\) kg the unit of length equals \(\beta\) m, and the unit of time is \(\gamma\) s then the magnitude of calories in terms of new units is:
1. \(4.2\alpha^{-2}\beta^{-2}\gamma^{2}\)
2. \(4.2\alpha^{2}\beta^{-2}\gamma^{2}\)
3. \(4.2\alpha^{-1}\beta^{-2}\gamma^{2}\)
4. 
\(4.2\alpha^{-1}\beta^{2}\gamma^{-2}\)

Subtopic:  Dimensions |
 68%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which of the following is the most precise device for measuring length?

1. a vernier calliper with \(20\) divisions on the sliding scale.
2. a screw gauge of pitch \(1\) mm and \(100\) divisions on the circular scale.
3. an optical instrument that can measure the length within a wavelength of light.
4. both (1) and (2)

Subtopic:  Measurement & Measuring Devices |
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The number of significant figures in \(0.0006032\) m2 is:

1. 4 2. 5
3. 7 4. 3
Subtopic:  Significant Figures |
 83%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A physical quantity \(P\) is related to four observables \(a,\) \(b,\) \(c,\) and \(d\) as follows;   \(P=\frac{a^{3}b^{2}}{\sqrt{c}d}.\)
The percentage errors of measurement in \(a,\) \(b,\) \(c,\) and \(d\) are 1%, 3%, 4% and 2%, respectively. Then the percentage error in the quantity \(P\) is:
1. 12%
2. 13%
3. 14%
4. 15%

Subtopic:  Errors |
 75%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

When the planet Jupiter is at a distance of 824.7 million kilometres from the Earth, its angular diameter is measured to be 35.72” of arc. Then the diameter of Jupiter is:

1 1.34×109 m
2 1.43×109 m
3 1.34×108 m
4 1.43 ×108 m

Subtopic:  Measurement & Measuring Devices |
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links

A new unit of length is chosen such that the speed of light in the vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes \(8\) min and \(20\) secs to cover this distance?

1. \(500\) new units of length.
2. \(100\) new units of length.
3. \(300\) new units of length.
4. \(200\) new units of length.

Subtopic:  Dimensions |
 64%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

A student measures the thickness of a human hair by looking at it through a microscope of magnification \(100.\) He makes \(20\) observations and finds that the average width of the hair in the field of view of the microscope is \(3.5\) mm. The thickness of the hair is:
1. \(0.035\) mm
2. \(0.0035\) mm
3. \(0.35\) mm
4. \(3.5\) mm

Subtopic:  Measurement & Measuring Devices |
 61%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The photograph of a house occupies an area of 1.75 cm2 on a 35 mm slide. The slide is projected onto a screen, and the area of the house on the screen is 1.55 m2. What is the linear magnification of the projector-screen arrangement?

(1) 90.0

(2) 94.1

(3) 99.9

(4) 97.7

Subtopic:  Measurement & Measuring Devices |
 56%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links

The length, breadth, and thickness of a rectangular sheet of metal are \(4.234\) m, \(1.005\) m, and \(2.01\) cm respectively. The volume of the sheet to correct significant figures is:
1. \(0.00856\) m3
2. \(0.0856\) m3
3. \(0.00855\) m3
4. \(0.0855\) m3

Subtopic:  Significant Figures |
 58%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

Which one of the following formulas is dimensionally incorrect?

1 y=asin2πtT
2 y=a2sin2πtT+cos2πtT
3 y=asinvt
4 y=asin2πtT+π

Subtopic:  Dimensions |
 63%
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
Hints
Links