Question 1

A 2 kg block is pushed across a horizontal surface with a constant velocity by a horizontal force of 10 N. If the coefficient of kinetic friction between the block and the surface is $$\mu_k$$, what is the value of $$\mu_k$$?

Accepted Answer

$$\mu_k = 0.2$$

Question 2

A patient receives an electric shock from a defibrillator that delivers a current of $$2\ 	ext{A}$$ for $$0.01\ 	ext{s}. $$What is the total charge transferred to the patient?

Accepted Answer

$$0.02\ 	ext{C}$$

Question 3

A 5 $$\Omega$$ resistor is connected to a 10 V battery. What is the power dissipated by the resistor?

Accepted Answer

$$20\ 	ext{W}$$

Question 4

A 0.5 kg ball is dropped from a height of 2 m. Ignoring air resistance, what is its velocity just before hitting the ground? (Take $$g = 9.8\ 	ext{m/s}^2)$$

Accepted Answer

$$v = 6.26\ 	ext{m/s}$$

Question 5

A 10 $$\muF $$capacitor is charged to 100 V. How much energy is stored in the capacitor?

Accepted Answer

$$0.1\ 	ext{J}$$

Question 6

A sound wave in air has a frequency of 1,000 Hz and a wavelength of 0.34 m. What is the speed of sound in air according to these values?

Accepted Answer

$$v = 340\ 	ext{m/s}$$

Question 7

A radioactive isotope has a half-life of 6 hours. If you start with 80 mg, how much remains after 18 hours?

Accepted Answer

10 mg

Question 8

A patient’s blood pressure is measured as 120 mmHg. What is this pressure in pascals? (1 mmHg = 133 Pa)

Accepted Answer

$$15,960\ 	ext{Pa}$$

Question 9

A 0.2 kg mass attached to a spring oscillates with amplitude 0.1 m and spring constant $$k = 50\ 	ext{N/m}. $$What is the maximum speed of the mass?

Accepted Answer

$$1.58\ 	ext{m/s}$$

Question 10

A ray of light passes from glass ($$n = 1.5) $$into air ($$n = 1.0). $$What is the critical angle for total internal reflection?

Accepted Answer

$$	heta_c = 41.8^\circ$$

Question 11

A 1.0 kg object is moving at 3.0 m/s. What is its kinetic energy?

Accepted Answer

$$4.5\ 	ext{J}$$

Question 12

A transformer has 100 turns on the primary coil and 500 turns on the secondary coil. If the input voltage is 120 V, what is the output voltage?

Accepted Answer

$$600\ 	ext{V}$$

Question 13

A gas in a sealed syringe is compressed from 2.0 L to 1.0 L at constant temperature. If the initial pressure was 100 kPa, what is the final pressure?

Accepted Answer

$$200\ 	ext{kPa}$$

Question 14

A 0.5 m long string fixed at both ends vibrates at its fundamental frequency. If the speed of waves on the string is 200 m/s, what is the fundamental frequency?

Accepted Answer

$$200\ 	ext{Hz}$$

Question 15

A 70 kg patient stands on a scale in an elevator accelerating upward at $$2\ 	ext{m/s}^2. $$What is the reading on the scale?

Accepted Answer

$$840\ 	ext{N}$$

Question 16

A 0.1 kg sample of water at $$20^\circC $$absorbs $$8,400 J of $$heat. What is the final temperature? (Specific heat of water $$c = 4,200\ 	ext{J/kg} \cdot ^\circC)$$

Accepted Answer

$$40^\circC$$

Question 17

A 2 kg object moves in a circle of radius 0.5 m at a speed of 4 m/s in a uniform magnetic field perpendicular to the plane of motion. What is the magnitude of the magnetic force if the object carries a charge of 1 C?

Accepted Answer

$$F = 4B\ 	ext{N}$$

Question 18

A patient’s ECG machine uses a resistor of $$1\ 	ext{k}\Omega$$ and operates at 5 V. What is the current through the resistor?

Accepted Answer

$$5\ 	ext{mA}$$

Question 19

A radioactive sample decays according to $$N(t) = N_0$ e$$^{-\lambda t}$$. If $$\lambda = 0.1\ 	ext{hr}^{-1}$$, what fraction of the original nuclei remains after 10 hours?

Accepted Answer

$$e^{-1}$$ \approx 0.37$$

Comprehensive Physics Study Notes for Medical Entrance Exam (PUMS 2025)

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