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Exam:
185 quizzes
A hydrogen atom in its ground state takes in a photon of 13.22 eV. To which level does the electron go? New
High School (11–12) · Atoms and Atomic Spectra
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A wire is drawn out to 3 times its length, and its volume stays the same. What happens to its resistance? New
High School (11–12) · Current Electricity
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A 60 W and a 40 W bulb, both made for 220 V, are joined in series to a 220 V supply. Which glows brighter? New
High School (9–10) · Current Electricity
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A satellite flies at a height of half the Earth's radius above the ground. What is g there? (g = 9.8 m/s² on the ground) New
High School (9–10), General · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A copper wire and a steel wire of the same length carry the same load and stretch by the same amount. What is the ratio of the copper wire's diameter to the steel wire's? (Y: steel 2.0 × 10¹¹ Pa, copper 1.1 × 10¹¹ Pa.) New
High School (11–12) · Elasticity and Mechanical Properties of Solids
NEET, Board Exam, A-Level
StemPy LabStemPy Lab
Hard
A steel wire 20 m long hangs down a mine shaft under its own weight. By how much does it stretch? (Density of steel 7800 kg/m³, Y = 2.0 × 10¹¹ Pa, g = 9.8 m/s².) New
High School (11–12) · Elasticity and Mechanical Properties of Solids
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
A body weighs 72 N on the Earth's surface. At what height above the surface, in kilometres, would it weigh 8 N? Take R = 6400 km. New
High School (11–12) · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A 125 kg space probe is hauled from the ground to a point one Earth radius (6400 km) above it, ending at rest. How many gigajoules (10⁹ J) of work does this take? Take g = 10 m/s² at the surface. New
High School (11–12) · Gravitation
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Two blocks, 4.0 kg and 2.0 kg, sit side by side on a smooth table. A horizontal force of 18 N pushes the 4.0 kg block, and both move together. What force does the 4.0 kg block exert on the 2.0 kg block? New
High School (11–12) · Newton's Laws of Motion
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
Blocks of 4.0 kg and 2.0 kg hang from the two ends of a light string over a smooth pulley, and are let go. Taking g = 9.8 m/s², what is the tension in the string? New
High School (11–12) · Newton's Laws of Motion
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A body falls from rest from a height R above the Earth's surface. Ignoring air, how fast does it hit the ground? (g = 9.8 m/s², R = 6.4 × 10⁶ m.) New
High School (11–12) · Gravitation
JEE Main, NEET, BITSAT, WBJEE, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A diatomic gas is warmed at a steady pressure. What fraction of the heat it takes in goes into its internal energy? New
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases
NEET, Board Exam
StemPy LabStemPy Lab
Medium
1.0 mol of a monatomic gas is mixed with 1.0 mol of a diatomic gas. What is γ for the mixture? New
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
2.0 mol of an ideal gas at 300 K expands isothermally from 5.0 litres to 20 litres. How much heat does it take in? (R = 8.31 J mol⁻¹K⁻¹.) New
High School (11–12) · Thermodynamic Processes and Specific Heats of Gases
NEET, Board Exam
StemPy LabStemPy Lab
Medium
A cup of soup cools from 80 °C to 70 °C in 5.0 minutes in a room at 20 °C. Using the average temperature in each interval, how long does it take to cool from 70 °C to 60 °C? New
High School (11–12) · Heat Transfer
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
A 40 g ice cube at 0 °C is put into 0.25 kg of juice (treat it as water) at 30 °C. What is the final temperature once the ice has melted? (Latent heat of fusion 3.34 × 10⁵ J/kg, c = 4186 J kg⁻¹K⁻¹.) New
High School (11–12) · Calorimetry and Change of State
JEE Main, NEET, BITSAT, WBJEE, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A glass flask of 100 cm³ is filled to the brim with mercury and heated by 50 K. How much mercury spills? (γ of mercury 1.8 × 10⁻⁴ K⁻¹; α of glass 0.9 × 10⁻⁵ K⁻¹.) New
High School (11–12) · Temperature and Thermal Expansion
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
A steel measuring tape is correct at 20 °C. On a 45 °C day a surveyor uses it and reads 80.000 m. What is the true distance? (α = 1.2 × 10⁻⁵ K⁻¹.) New
High School (11–12) · Temperature and Thermal Expansion
NEET, Board Exam
StemPy LabStemPy Lab
Hard
A pendulum clock with a steel rod keeps correct time at 20 °C. How many seconds does it lose in a day at 40 °C? (α = 1.2 × 10⁻⁵ K⁻¹; T ∝ √L.) New
High School (11–12) · Temperature and Thermal Expansion
JEE Main, NEET, BITSAT, WBJEE, Board Exam
StemPy LabStemPy Lab
Hard
In a Venturi meter carrying water, the throat has a third of the area of the main pipe. The pressure in the throat is 6.0 kPa lower. How fast does the water flow in the main pipe? New
High School (11–12) · Fluid Flow, Bernoulli's Principle and Viscosity
NEET, Board Exam, AP
StemPy LabStemPy Lab
Hard
A wide tank of cross-section 0.50 m² holds water 1.25 m deep. A hole of area 2.0 cm² is opened at its bottom. At what rate does the water level start to fall? (g = 9.8 m/s².) New
High School (11–12) · Fluid Flow, Bernoulli's Principle and Viscosity
NEET, Board Exam, AP
StemPy LabStemPy Lab
Hard
Taking g = 10 m/s², water leaves a small hole 1.25 m below the surface of a tank, moving sideways. The hole is 5.0 m above the ground. How far from the tank, in metres, does the jet land? New
High School (11–12) · Fluid Flow, Bernoulli's Principle and Viscosity
JEE Main, NEET, BITSAT, WBJEE, Board Exam, AP
StemPy LabStemPy Lab
Medium
A block floats in water with 35 of its volume under the surface. In an oil it floats with 45 of its volume under. What is the density of the oil? New
High School (11–12) · Pressure and Fluids
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
A tank holds water 0.50 m deep inside a lift. The lift speeds up upward at 2.0 m/s². What is the gauge pressure at the bottom of the tank? (g = 9.8 m/s².) New
High School (11–12) · Pressure and Fluids
NEET, Board Exam, AP, A-Level
StemPy LabStemPy Lab
Hard
A hollow metal ball of mass 2.0 kg has an outer radius of 6.0 cm. Held fully under water, what is the buoyant force on it? Will it float when let go? (g = 9.8 m/s².) New
High School (11–12) · Pressure and Fluids
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Hard
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