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Exam Review

Key Facts: STMKG Exam

Multiple-choice items on the STMKG SKB (32 Physics, 28 Mathematics, 20 English)

Buku Pedoman PTB STMKG 2026 (reported by Medcom)

90 min

Time limit for the STMKG SKB

Buku Pedoman PTB STMKG 2026 (reported by Medcom)

130

PTB STMKG 2026 formation across four D4 programs

BMKG Stasiun Meteorologi Tampa Padang

+5 / 0

SKB scoring for correct and wrong answers

Buku Pedoman PTB STMKG 2026 (reported by Medcom)

The STMKG SKB has 80 multiple-choice items in 90 minutes (32 Physics, 28 Mathematics, 20 English), scored +5 correct and 0 wrong, with Physics as the first tiebreaker. OpenExamPrep offers independent English-language practice across those three subjects; it is not an official translation or simulation.

Sample STMKG Practice Questions

Try these sample questions to review concepts for the STMKG exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A weather balloon rises vertically from the ground with a constant acceleration of 2 m/s^2. After 10 s, a sensor package detaches from the balloon. Taking g = 10 m/s^2 and ignoring air resistance, what is the maximum height the sensor reaches above the ground?

A.100 m

B.120 m

C.140 m

D.80 m

Explanation: At release, the balloon's height is (1/2)(2)(10)^2 = 100 m and its speed is (2)(10) = 20 m/s upward. The sensor keeps that upward speed and decelerates at g, rising a further v^2/(2g) = 400/20 = 20 m. Its maximum height is 100 + 20 = 120 m.

2A 4 kg block is placed on a rough incline at 37° to the horizontal (sin 37° = 0.6, cos 37° = 0.8). The coefficients of static and kinetic friction are 0.5 and 0.4. With g = 10 m/s^2, what is the friction force on the block?

A.12.8 N

B.16.0 N

C.24.0 N

D.32.0 N

Explanation: The weight component along the incline is 4 × 10 × 0.6 = 24 N, and the normal force is 4 × 10 × 0.8 = 32 N. Maximum static friction is 0.5 × 32 = 16 N, which is less than 24 N, so the block slides. Kinetic friction then acts: 0.4 × 32 = 12.8 N.

3A projectile is launched from the ground at 45° with an initial speed of 40 m/s. Ignoring air resistance and taking g = 10 m/s^2, what is the radius of curvature of its path at the highest point?

A.40 m

B.160 m

C.80 m

D.80√2 m

Explanation: At the top, the velocity is purely horizontal: v = 40 cos 45° = 20√2 m/s. Gravity is perpendicular to this velocity, so it supplies the centripetal acceleration: g = v^2/R. Therefore R = (20√2)^2/10 = 800/10 = 80 m.

4Object A (2 kg) moves right at 6 m/s and object B (3 kg) moves left at 4 m/s on a frictionless track. They collide perfectly elastically. What is A's velocity immediately after the collision?

A.4 m/s to the left

B.6 m/s to the right

C.0 m/s (at rest)

D.6 m/s to the left

Explanation: Take right as positive. Momentum: 2(6) + 3(-4) = 0 = 2vA' + 3vB'. For an elastic collision the relative speed reverses: vB' - vA' = 6 - (-4) = 10. Substituting vB' = vA' + 10 gives 5vA' + 30 = 0, so vA' = -6 m/s, meaning 6 m/s to the left.

5A solid cylinder of mass M and radius R rolls without slipping down an incline from height h. What is the speed of its center of mass at the bottom?

A.√(2gh)

B.√(4gh/3)

C.√(10gh/7)

D.√(gh)

Explanation: For a solid cylinder I = (1/2)MR^2, and rolling without slipping means ω = v/R. Energy conservation gives Mgh = (1/2)Mv^2 + (1/2)(1/2)MR^2(v/R)^2 = (3/4)Mv^2. So v^2 = 4gh/3 and v = √(4gh/3).

6The gravitational acceleration at Earth's surface is g0 and Earth's radius is R. What is the gravitational acceleration on a weather satellite at an altitude of 0.5R above the surface?

A.2/3 g0

B.1/2 g0

C.4/9 g0

D.1/4 g0

Explanation: Gravitational acceleration falls with the square of distance from Earth's center: g = g0(R/r)^2. The satellite is at r = R + 0.5R = 1.5R, so g = g0(1/1.5)^2 = 4/9 g0.

7A simple pendulum has period T at a sea-level laboratory on the equator. It is taken to a geophysical station at the pole, where gravitational acceleration is 1.005 times its value at the equator. How does the pendulum's period change?

A.It decreases by about 0.25%

B.It increases by about 0.50%

C.It increases by about 0.25%

D.It decreases by about 0.50%

Explanation: T = 2π√(L/g), so T is proportional to g^(-1/2). For small changes, ΔT/T ≈ -(1/2)(Δg/g) = -(1/2)(0.5%) = -0.25%. The period decreases by about 0.25%.

8The Coriolis force that deflects moving air masses in Earth's atmosphere arises because of:

A.Earth's revolution around the Sun

B.Uneven solar heating between the equator and the poles

C.The interaction of Earth's magnetic field with the solar wind

D.Earth's rotation, observed from a rotating (non-inertial) reference frame

Explanation: The Coriolis force is an apparent force that appears when motion is described from a rotating frame, such as the surface of the spinning Earth. It deflects winds to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.

9A spring with spring constant k is cut into two equal halves. The two halves are connected in parallel to support a seismometer mass. What is the effective spring constant of the arrangement?

A.2k

B.4k

C.k/4

D.k

Explanation: A spring's constant is inversely proportional to its length, so each half has constant 2k. Springs in parallel add their constants, giving 2k + 2k = 4k.

10A uniform ladder of weight 200 N and length 4 m leans against a smooth vertical wall and rests on a rough floor, making an angle of 60° with the floor. What is the minimum coefficient of static friction between the ladder and the floor that keeps the ladder from slipping?

A.1/√3

B.√3/2

C.1/(2√3)

D.1/2

Explanation: Vertically, the floor's normal force equals the weight W. Horizontally, friction f equals the wall's normal force N. Taking torques about the foot: N × L sin 60° = W × (L/2) cos 60°, so N = (W/2) cot 60°. At the point of slipping f = μW, so μ = (1/2) cot 60° = 1/(2√3), about 0.29.

About the STMKG Exam

STMKG is the meteorology, climatology, and geophysics college of BMKG. After the national SKD, candidates take the Seleksi Kompetensi Bidang in physics, mathematics, and English, followed by fitness, interview, and health stages. This bank is an English-language MCQ study adaptation of the SKB subjects.

Exam sponsor: Panitia PTB STMKG (BMKG), with CAT tests delivered by BKN. The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Seleksi Administrasi -> SKD CAT BKN (100 minutes; top 3x the formation per program advance) -> SKB (80 items in 90 minutes; ranked by total score, ties broken by Physics then Mathematics; top 2x the formation advance) -> Tes Kebugaran (Cooper test, 2.4 km), Wawancara, and Pemeriksaan Kesehatan, each eliminating.

Time Limit

90 minutes for the SKB (100 minutes for the SKD)

Passing Score

SKD thresholds: TWK 65, TIU 80, TKP 156 (Afirmasi: cumulative 281 with TIU 55). The SKB is ranked rather than thresholded, and a score of 0 in any subject disqualifies a tied candidate.

Exam / Certification Fees

Rp75,000 registration, plus Rp100,000 BKN CAT fee for the SKD and Rp100,000 for the SKB

Exam sponsor website

Reported exam pass rate: Not published. Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Official sources

PTB STMKG Official Portal (Buku Pedoman PTB STMKG 2026) · Source checked 2026-09-14
BMKG Stasiun Meteorologi Tampa Padang: STMKG PTB 2026/2027 announcement · Source checked 2026-09-14
Portal SSCASN (BKN) · Source checked 2026-09-14

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

40 of 100 practice questions

Physics (Fisika)

Kinematics and dynamics, rotation, gravitation, fluids, heat and thermodynamics, atmospheric physics, waves, optics, electricity, magnetism, and the photoelectric effect.

35 of 100 practice questions

Mathematics (Matematika)

Limits, derivatives, integrals, quadratics, polynomials, exponents, sequences, trigonometry, vectors, analytic geometry, combinatorics, and statistics.

25 of 100 practice questions

English (Bahasa Inggris)

Grammar and structure, error recognition, scientific vocabulary, and reading passages on climate and geophysical hazards.

Preparing for the STMKG Exam

What You Need to Know

Passing score: SKD thresholds: TWK 65, TIU 80, TKP 156 (Afirmasi: cumulative 281 with TIU 55). The SKB is ranked rather than thresholded, and a score of 0 in any subject disqualifies a tied candidate.
Assessment: Seleksi Administrasi -> SKD CAT BKN (100 minutes; top 3x the formation per program advance) -> SKB (80 items in 90 minutes; ranked by total score, ties broken by Physics then Mathematics; top 2x the formation advance) -> Tes Kebugaran (Cooper test, 2.4 km), Wawancara, and Pemeriksaan Kesehatan, each eliminating.
Time limit: 90 minutes for the SKB (100 minutes for the SKD)
Exam / certification fees: Rp75,000 registration, plus Rp100,000 BKN CAT fee for the SKD and Rp100,000 for the SKB Official sources

Using Our Practice Resources

Work through all 100 available questions
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STMKG: Suggested Study Strategy

1Prioritize Physics: it has the most SKB items (32) and is the first tiebreaker in the ranking.

2Practice atmospheric applications of core physics, such as hydrostatic pressure, adiabatic cooling, and radiation laws, alongside standard mechanics.

3Answer every item, because a wrong answer costs nothing on the SKB.

4Keep at least some correct answers in every subject, since a 0 in any subject disqualifies a tied candidate.

Frequently Asked Questions

What subjects are tested in the STMKG SKB?

The SKB has 80 multiple-choice questions in 90 minutes: 32 Physics (Fisika), 28 Mathematics (Matematika), and 20 English (Bahasa Inggris).

How is the STMKG SKB scored?

Each correct answer earns 5 points and a wrong or blank answer earns 0, so there is no negative marking and the maximum is 400.

What happens if STMKG candidates tie on the SKB?

Ties are broken by the Physics score and then the Mathematics score. If candidates are still tied, all of them pass the SKB provided none has a 0 in any subject.

Who can apply for PTB STMKG 2026?

Indonesian SMA/MA/SMK graduates (or final-year students) in any major, aged 15 to 23 on 1 November 2026, unmarried, not colour blind, and at least 155 cm (men) or 150 cm (women) tall.

Is this bank an official STMKG test simulation?

No. It is independent practice by OpenExamPrep: English-language multiple-choice questions for studying the SKB subjects. It is not an official translation and does not simulate the Indonesian-language CAT.