ETEA MDCAT Past Paper 2024 Page 7

ETEA MDCAT Past Paper 2024

121- What is the mass of 1 mole of calcium carbonate (CaCO₃)?

A. 50g

B. 75g

C. 100g

D. 125g

View Answer

Answer : C. 100g

Description

122- Which one of the following molecules has a pyramidal structure?

A. C₂H₄

B. CH₄

C. H₂O

D. NH₃

View Answer

Answer : D. NH₃

Description

123- A wheel makes 3 complete revolutions. What is the total number of radians through which a point on wheel has rotated?

A. 2π

B. 3π

C. 6π

D. 9π

View Answer

Answer : C. 6π

Description

124- For rigid body that rotates about a fixed axis, the angle swept out by a line passing through any point on the body and intersecting the axis of rotation perpendicularly is called?

A. Angular acceleration

B. Angular displacement

C. Angular velocity

D. Angular momentum

View Answer

Answer : B. Angular displacement

Description

125- In a rotating spaceship, to produce artificial gravity, what does the centripetal force do?

A. Increases spaceship’s rotation

B. Has no effect inside the spaceship

C. Pulls objects towards the centre

D. Pushes the objects towards the outer wall

View Answer

Answer : D. Pushes the objects towards the outer wall

Description

126- When the mass of a body moving along a circle becomes half and radius becomes double, and v is constant, the centripetal force becomes?

A. Double

B. Half

C. One-fourth

D. Remains Same

View Answer

Answer : C. One-fourth

Description

127- What happens when two waves of the same frequency and amplitude meet in phase?

A. They produce a wave with the same amplitude as the individual waves

B. They combine to form a wave double the amplitude, resulting in constructive interference

C. They produce a wave with zero amplitude

D. They cancel each other out resulting in a destructive interference

View Answer

Answer : B. They combine to form a wave double the amplitude, resulting in constructive interference

Description

128- Which type of waves can be polarized?

A. Longitudinal waves

B. Mechanical waves

C. Sound waves

D. Transverse waves

View Answer

Answer : D. Transverse waves

Description

129- For longitudinal waves:

A. The particles of the medium remain stationary as the wave passes through

B. The particles of the medium oscillate perpendicular to the wave’s propagation

C. The particles of the medium oscillate along the direction of the wave’s propagation

D. Their velocity is enhanced when they travel through vacuum

View Answer

Answer : C. The particles of the medium oscillate along the direction of the wave’s propagation

Description

130- According to the principle of superimposition, when 2 or more waves overlap at a point in space, the amplitude of the resultant wave at that point is?

A. Always zero

B. The product of the individual wave amplitude

C. The product of the frequencies of the individual waves

D. The sum of the amplitudes of the individual waves

View Answer

Answer : D. The sum of the amplitudes of the individual waves

Description

131- The speed of sound in a medium containing ideal gas is NOT dependent on:

A. Density

B. Moisture

C. Pressure

D. Temperature

View Answer

Answer : C. Pressure

Description

132- A tuning fork having angular frequency equal 440Hz produces sound waves which travel with the speed of 340 m/s. What is the separation between a compression and the adjacent rarefaction of the sound waves?

A. 0.57 m

B. 0.67 m

C. 0.77 m

D. 0.87 m

View Answer

Answer : C. 0.77 m

Description

133- A police car, with its siren on, is moving towards a stationary listener. How does the stationary listener receive the frequency of the sound emitted by the siren? It

A. Decreases

B. Increases

C. Stays the same

D. Varies randomly

View Answer

Answer : B. Increases

Description

134- In an adiabatic process, how does the temperature of a gas change as its volume decreases?

A. The temperature decreases

B. The temperature increases

C. The temperature remains constant

D. The temperature first increases then decreases

View Answer

Answer : B. The temperature increases

Description

135- During an isothermal expansion of an ideal gas, which of the following statement is true?

A. The internal energy of the gas increases

B. Pressure and temperature of the gas increase

C. The temperature of the gas remains constant

D. The work done by the gas is zero

View Answer

Answer : C. The temperature of the gas remains constant

Description

136- Consider an ideal gas confined to the cylinder with a fixed piston, on heating the gas, all the heat supplied increases:

A. Kinetic energy of the molecules

B. Potential Energy of the molecules

C. The intermolecular forces between gas molecules

D. The number of gas molecules

View Answer

Answer : A. Kinetic energy of the molecules

Description

137- What is the increase in force between two charges if the separation between them is decreased by 50 percent?

A. Becomes four times

B. Doubles

C. Increases by half

D. Triples

View Answer

Answer : A. Becomes four times

Description

138- According to Coulomb’s law, what happens to the electrostatic force between the 2-point charges if the distance between them is doubled?

A. The force becomes one-fourth

B. The force becomes half

C. The force doubles

D. The force remains the same

View Answer

Answer : A. The force becomes one-fourth

Description

139- What does one Coulomb represent in terms of charge?

A. The amount of charge transported by a current of 1 Ampere in 1 second

B. The charge of 1 proton

C. The charge of 1 electron

D. The charge required to create a force of 1 Newton between two charges separated by 1 meter

View Answer

Answer : A. The amount of charge transported by a current of 1 Ampere in 1 second

Description

140- Two points charges, +5µC and -5µC are placed at points A and B, respectively, which are separated by a distance 2d. What is the electric potential at the midpoint M of the line joining A and B?