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A ball is thrown vertically upwards from the ground with an initial velocity of 50m/s. what is the total time spent by the ball in the air?

A) 2.5s

B) 5.0s

C) 10.0s

D) 15.0s

E) 20.0s

Related Lesson: Height of a Projectile Example | One-Dimensional Motion

Comments (4)A body of mass 60g appears to have a mass of 39g when totally immersed in oil and appears to have mass of 36g when totally immersed water. Calculate the relative density of oil.

A) \(\frac{8}{7}\)

B) \(\frac{13}{12}\)

C) \(\frac{12}{13}\)

D) \(\frac{7}{8}\)

E) \(\frac{13}{20}\)

Related Lesson: More Density Measurements | Fluid Statics

Comments (6)Two resistors R\(_1\), and R\(_2\) are connected in parallel, R\(_2\) being greater than R\(_1\) the combined resistance is

A) Less than R\(_1\)

B) greater than R\(_2\)

C) The sum of R\(_1\)

D) The difference of R\(_1\), and R\(_2\)

E) greater than R\(_1\) but less than R\(_2\)

Related Lesson: Introducing Resistors in Series and Parallel | Circuits and DC Instruments

Comments (5)Two capacitance of 6\(\mu f\) and 8\(\mu f\) are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu f\)?

A) 3\(\mu f\)

B) 16\(\mu f\)

C) 24\(\mu f\)

D) 30\(\mu f\)

E) 14\(\mu f\)

Related Lesson: Capacitance in Series | Electric Potential and Electric Field

Comments (1)The upper and lower fixed points of the thermometer are 90 and 10 respectively. Determine the temperature on the Kelvin scale when the reading on T is 30\(^{\circ}\).

A)

25K

B)

298K

C)

80K

D)

303K

E)

293K

Related Lesson: Temperature Scales | Temperature, Kinetic Theory, and Gas Laws

Comments (5)If a copper has a heat capacity of 80J/\(^{\circ}\)C and specific heat capacity of 400J/Kg, calculate its mass.

A) 0.20kg

B) 320kg

C) 20.0kg

D) 0.02kg

E) 5kg

Related Lesson: Temperature Change and Heat Capacity | Heat and Heat Transfer Methods

Comments (1)An object of height 12.0cm is placed 240cm from 3 pinhole camera. If the image distance from the pinhole is 10.0cm, calculate the image height.

A) 12.0cm

B) 5.0cm

C) 120.0cm

D) 120.0m

E) None of the above

Related Lesson: Image Formation by Thin Lenses | Geometric Optics

Comments (2)Calculate the minimum value of the refractive index of a 45\(^{\circ}\) prism which used to tum a beam of light by total internal reflection through 90\(^{\circ}\).

A)

1.67

B)

1.50

C)

1.41

D)

1.20

E)

4.11

Related Lesson: Refractive Index | Optics and Optical Phenomena

Comments (3)A wave of frequency 75Hz form a stationary pattern in a medium where the distance between adjacent nodes is 2.0m. what is the velocity of the wave?

A) 3m/s

B) 30m/s

C) 300m/s

D) 0.3m/s

E) 150m/s

Related Lesson: Summarizing Waves | Oscillatory Motion and Waves

Comments (3)The half-life of a nuclide is 5 days, what fraction of the initial sample will remain after 30 days.

A) \(\frac{1}{8}\)

B) \(\frac{1}{16}\)

C) \(\frac{1}{32}\)

D) \(\frac{1}{36}\)

E) \(\frac{1}{64}\)

Related Lesson: Parallel Resistors Continued | Electric Circuits

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