Major Competitive Exams

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Q. A light ray traveling in diamond (n=2.42) strikes the diamond-air interface. What is the critical angle for total internal reflection?
  • A. 24.4°
  • B. 30.0°
  • C. 36.0°
  • D. 42.0°
Q. A light ray traveling in glass (n=1.5) strikes the glass-air interface at an angle of 30°. Will it undergo total internal reflection?
  • A. Yes
  • B. No
  • C. Depends on the angle
  • D. Not enough information
Q. A line graph shows the growth of a plant over 5 days. If the heights are 2 cm, 4 cm, 6 cm, 8 cm, and 10 cm, what is the growth rate per day? (2023)
  • A. 1 cm
  • B. 2 cm
  • C. 3 cm
  • D. 4 cm
Q. A line graph shows the sales of a company over five months. If the sales were 1000, 1500, 2000, 2500, and 3000 units, what was the total sales over the five months? (2023)
  • A. 10000
  • B. 12000
  • C. 15000
  • D. 20000
Q. A line segment is divided into two parts in the ratio 3:2. If the total length of the segment is 50 cm, what is the length of the longer part? (2023)
  • A. 30 cm
  • B. 20 cm
  • C. 25 cm
  • D. 15 cm
Q. A liquid drop is formed on a surface. The angle formed between the tangent to the drop surface and the solid surface is called what?
  • A. Contact angle
  • B. Surface angle
  • C. Tension angle
  • D. Cohesion angle
Q. A liquid has a surface tension of 0.03 N/m. What is the height of the liquid column that can be supported by a capillary tube of radius 0.5 mm?
  • A. 1.2 cm
  • B. 2.4 cm
  • C. 3.6 cm
  • D. 4.8 cm
Q. A liquid has a surface tension of 0.03 N/m. What is the pressure difference across a curved surface of radius 0.1 m?
  • A. 0.15 Pa
  • B. 0.3 Pa
  • C. 0.6 Pa
  • D. 0.9 Pa
Q. A loan of $5000 is taken at a compound interest rate of 5% per annum. What will be the total amount to be paid after 3 years?
  • A. $5750
  • B. $6300
  • C. $6500
  • D. $7000
Q. A loan of $5000 is taken at a compound interest rate of 6% per annum. What will be the total amount to be paid after 3 years? (1910)
  • A. $5900
  • B. $6000
  • C. $6100
  • D. $6200
Q. A loan of $5000 is taken at a simple interest rate of 10% per annum. How much interest will be paid after 4 years? (2000)
  • A. $200
  • B. $400
  • C. $600
  • D. $800
Q. A loan of $8000 is taken at a compound interest rate of 7% per annum. What will be the total amount to be paid after 4 years? (2000)
  • A. $10000
  • B. $11000
  • C. $12000
  • D. $13000
Q. A loan of Rs. 2000 is taken at a simple interest rate of 8% per annum. How much interest will be paid after 4 years? (2000)
  • A. Rs. 640
  • B. Rs. 480
  • C. Rs. 320
  • D. Rs. 560
Q. A location at 30° N latitude experiences a temperature of 25°C. If the same temperature is recorded at 30° S latitude, what can be inferred about the climate? (2019)
  • A. Identical climate
  • B. Different climate
  • C. Warmer in the North
  • D. Colder in the South
Q. A location at 45° North latitude experiences a time difference of how many hours from a location at 45° South latitude when both are at the same longitude? (2019)
  • A. 0 hours
  • B. 1 hour
  • C. 2 hours
  • D. 3 hours
Q. A location at 90 degrees West longitude is how many hours behind GMT?
  • A. 3 hours
  • B. 5 hours
  • C. 6 hours
  • D. 7 hours
Q. A long straight conductor carries a current I. What is the magnetic field at a distance r from the wire?
  • A. μ₀I/(2πr)
  • B. μ₀I/(4πr)
  • C. μ₀I/(πr)
  • D. μ₀I/(2r)
Q. A long straight conductor carrying current I produces a magnetic field B at a distance r from it. What is the expression for B?
  • A. μ₀I/(2πr)
  • B. μ₀I/(4πr)
  • C. μ₀I/(πr)
  • D. μ₀I/(8πr)
Q. A long straight wire carries a current I. What is the direction of the magnetic field at a point located directly above the wire? (2020)
  • A. Towards the wire
  • B. Away from the wire
  • C. Clockwise
  • D. Counterclockwise
Q. A long straight wire carries a current I. What is the magnetic field at a distance r from the wire?
  • A. μ₀I/(2πr)
  • B. μ₀I/(4πr)
  • C. μ₀I/(8πr)
  • D. μ₀I/(πr)
Q. A long straight wire carries a uniform linear charge density λ. What is the electric field at a distance r from the wire?
  • A. λ/(2πε₀r)
  • B. λ/(4πε₀r²)
  • C. λ/(2πε₀r²)
  • D. 0
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced EMF as the loop enters the field?
  • A. Induced EMF increases
  • B. Induced EMF decreases
  • C. Induced EMF remains constant
  • D. Induced EMF becomes zero
Q. A loop of wire is moved into a magnetic field at a constant speed. What happens to the induced current as the loop enters the magnetic field? (2023)
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is moved into a magnetic field at a constant speed. What is the effect on the induced current as the loop enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is moved into a uniform magnetic field at a constant speed. What happens to the induced EMF as it enters the field?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. A loop of wire is placed in a changing magnetic field. What phenomenon is observed?
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrolysis
  • D. Thermal conduction
Q. A loop of wire is placed in a changing magnetic field. What phenomenon is this an example of?
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrostatics
  • D. Magnetic hysteresis
Q. A loop of wire is placed in a changing magnetic field. What phenomenon occurs? (2021)
  • A. Electromagnetic induction
  • B. Magnetic resonance
  • C. Electrolysis
  • D. Magnetic levitation
Q. A loop of wire is placed in a uniform magnetic field. If the angle between the field and the normal to the loop is 60 degrees, what is the effective magnetic flux?
  • A. 0.5 B A
  • B. 0.866 B A
  • C. 0.866 B A²
  • D. B A
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